Fostering caring relationships: Suggestions to rethink liberal perspectives on the ethics of newborn screening

Abstract Newborn screening (NBS) involves the collection of blood from the heel of a newborn baby and testing it for a list of rare and inheritable disorders. New biochemical screening technologies led to expansions of NBS programs in the first decade of the 21st century. It is expected that they will in time be replaced by genetic sequencing technologies. These developments have raised a lot of ethical debate. We reviewed the ethical literature on NBS, analyzed the issues and values that emerged, and paid particular interest to the type of impacts authors think NBS should have on the lives of children and their families. Our review shows that most authors keep their ethical reflection confined to policy decisions, about for instance (a) the purpose of the program, and (b) its voluntary or mandatory nature. While some authors show appreciation of how NBS information empowers parents to care for their (diseased) children, most authors consider these aspects to be ‘private’ and leave their evaluation up to parents themselves. While this division of moral labor fits with the liberal conviction to leave individuals free to decide how they want to live their private lives, it also silences the ethical debate about these issues. Given the present and future capacity of NBS to offer an abundance of health‐related information, we argue that there is good reason to develop a more substantive perspective to whether and how NBS can contribute to parents’ good care for children.


| I NTR OD U CTI ON
Newborn screening (NBS) involves taking a few drops of blood from the heel or pulse of an infant in the first week of life and testing it for a list of serious and treatable diseases. 1 NBS programs evolved from a biochemical success story: they started from 1963 onwards, when American biochemist Robert Guthrie developed a blood test for phenylketonuria (PKU). PKU is a rare metabolic disease which-if left untreated-results in severe physical and mental retardation. Detection of PKU right after birth, coupled with a strict diet that avoids phenylalanine in food, largely prevented the detrimental effects of the disease. Given this health improvement, and the forceful lobby of pediatricians and parents of PKU-affected children, many countries in Europe, the Americas, Australia, and Asia started screening all newborn children for PKU. 2 NBS still targets solely PKU in some countries, but most countries have gradually added more diseases due to increased technological possibilities to detect them. 3  In our article we focus on blood-based NBS of noninfectious disorders. We exclude all other types of screening performed on newborns, such as a hearing test or pulse oximetry. availability of tandem mass spectrometry, which allows for the detection of over 60 diseases with a single test based on biochemical components of blood. As almost all diseases included in NBS-except for example congenital hypothyroidism, which many programs target-are genetic in nature, it is expected that these biochemical technologies used for screening will be replaced by next generation sequencing (NGS) technologies within 5-10 years, making it possible to disclose an abundance of health-related information at birth. 4 These developments have raised a lot of ethical debate. In this article we reviewed this ethical debate on NBS and analyzed the issues and values that emerge. The results of this analysis are presented in Sections 2 and 3 of this article as well as in Table 3. Our analysis will show, however, that the current debate about ethics of NBS has limitations, which can be explained on the basis of its tacit liberal presuppositions regarding what are and what are not appropriate topics for debate in policy-making, including policy about NBS. Consequently, issues about whether and how NBS can help parents to care well for their children are largely ignored, as liberalism prescribes policymakers to refrain from influencing the way in which people choose to lead their private lives including how they raise and care for their children. Many ethicists-especially communitarians and care ethicists -have, however, famously argued in the past that it is impossible to make policy that remains neutral about the good life. 5 In line with their way of thinking, we argue here that the envisioned future development of NBS programs make it important to discuss whether and how NBS should be allowed to influence caring relationships within the family. In Table 4 we suggest questions that provide a starting point to that debate.

| M E TH ODS
In this paper, we aimed to review the issues covered in ethical debates on NBS. By combining search terms related to these two elements (ethics and NBS), we searched for English language articles published between January 1, 2001 and July 1, 2016 in PubMed. Technologies able to detect many diseases with a single test were introduced in NBS programs starting in 2001, hence the chosen time period.
We screened the titles and abstracts of all articles identified for their eligibility. For inclusion, each paper had to (a) concern NBS for inherited diseases during the first weeks of life, making use of blood withdrawal, (b) contain discussion of ethical issues, and (c) be nonempirical in nature (i.e., theoretical, analytical, argumentative, opinionating, commentaries, conceptual, or review articles). When inclusion or exclusion could not be decided on the basis of title and abstract, we retained and reviewed a full-text copy.
Our initial search identified 336 records. Based on title and abstract, 193 could be excluded. The remaining 143 papers were read in full. A further 42 were excluded because they were unavailable, were not about NBS, did not contain any discussion of ethical issues, and/or were solely empirical in nature.
After this selection, 101 articles remained. We reviewed the content of these articles, and ordered the issues and questions in themes and subthemes, presented in Tables 1-3. A full search strategy containing the search terms used as well as a complete record of the reasons for exclusion at each step of the process is available upon request. Categories of diseases or disease information that can be included in NBS

Category of diseases or disease information Explanation
Treatable diseases Diseases that can be treated with medication or a diet, preventing or postponing death and significantly improving the prognosis of the child. PKU is the classic example of this disease, as it was the first disease for which most NBS programs started screening.

Untreatable diseases
Diseases for which no treatment is available. There may however be supportive measures available which may improve the condition of the child somewhat. Various metabolic and mitochondrial diseases belong to this category.
Late-onset diseases Treatable or untreatable diseases that develop later during childhood, adolescence, or adulthood. Examples are Fabry disease or Huntington's disease.

Risk information
Risk information does not provide the benefit of certainty, but reveals a probability that a person will develop a diseasesuch as breast or colon cancer, or diabetes-later in life. Sometimes interventions are available to prevent or decrease the probability of the disease occurring; sometimes no such measures are available.
Carrier status information Carrier status (CS) information is not beneficial to the health of the infant; it will only become (potentially) relevant to the child when it reaches reproductive age. CS information may be a by-product of screening with biochemical technologies such as tandem mass spectrometry or high-performance liquid chromatography. However, if WGS will be used to conduct NBS in the future, it will likely lead to the identification of a greater number of carriers of different conditions.
Disease information that is difficult to classify Some disease information may be difficult to classify in any of the above categories. Duchenne Muscular Dystrophy, for example, is a serious late(r)-onset disease in boys for it reveals its first symptoms at age 4-5. Girls are only carriers and 80-90% of girls will remain asymptomatic. Lysosomal storage disorders may produce symptoms later in childhood, but patients may also remain symptom-free until they are middle-aged. Pompe disease has earlier-and later-onset variants. Including these diseases means that NBS will produce different types of information for different people and some people would receive a diagnosis long before there are symptoms-if symptoms occur at all. In addition to these two themes, issues related to the justification of storage, governance, ownership and use of residual bloodspots after NBS also feature in the ethical literature on NBS. While relationships play a role here too, we chose to exclude this theme here because it is not exclusively discussed in the ethical literature about NBS, since residual blood may also be retained and stored after regular diagnoses or research and a presentation of the ethical issues raised about storage in the NBS literature would therefore be incomplete.  Nursing, 31, 190-196. Green, N. (2009  False positives Occurs when parents receive a positive result from NBS that indicates the child is diseased, but after follow-up diagnostic tests the child turns out not to have the disease after all.

Incidental/unsolicited/ unanticipated findings
Findings not targeted by the NBS program which the technology used for screening may accidentally produce. These findings can come in different varieties. They may reveal: the carrier status of an infant for a disease included in the program variants of diseases included in NBS that fall beyond the scope of the program (because they are mild and harmless or serious and untreatable) patients with variants of early-onset diseases that are later-onset (e.g., in adulthood) misattributed paternity the mother is diseased instead of the child a disease completely unrelated to diseases included in NBS (in NGS)

Uncertain or ambiguous test results
Findings that are suspect, but are not clearly associated with a disease. These may be: biochemical variants of unknown significance or 'immature' genetic variants which have not yet been given a stable interpretation genetic anomalies whose connection to the phenotype is unknown disease with varying penetrance from patient to patient Overdiagnosis A biochemical or genetic anomaly related to diseases included in the NBS program, but which does not actually cause disease symptoms in a particular person. Examples of non-diseases are variants of PKU and short-chain or medium-chain acyl CoA dehydrogenase deficiency, duarte variants of galactosemia or 3-methylcrotonyl-CoA carboxylase deficiency, which may present in varieties ranging from no symptoms to death. Historical studies support this criticism of the scientific justification for NBS. They describe that little was known even about PKU when national PKU screening programs were initially launched; mildly and more seriously affected children were treated in the same way, thus producing cognitive deficits in patients who were overtreated (Paul, op. cit. note 14; Mitchell, M. X. (2017). Screening out controversy: Human genetics, emerging techniques of diagnosis, and the origins of the social issues Committee of the American Society of Human Genetics, 1964Genetics, -1973. Journal of the History of Biology, 50, 425-456). Authors also sometimes shortly comment that if sufficient evidence should be provided that points out how the costs and benefits of NBS should be balanced to all alternative ways to spend money on health care for children, we would never have preventive programs as providing this evidence would be too complex and time-consuming. (Howell, R. R. (2009). Every child is priceless: Debating effective newborn screening policy. Hastings Center Report, 39, 4-6).  In discussions about the purpose of NBS, human rights function as a way to legitimize the selection of some diseases in the program, and oppose the inclusion of others.  In the following, we will distinguish different ways in which NBS influences lives by using the terms 'hard' and 'soft' impacts from philosophy of technology. 'Hard' impacts are typically quantifiable in terms of number of affected children or life years gained and constitute the most broadly accepted focus of NBS; 'soft' impacts refer to psychosocial impacts that influence the experienced quality of life and need to be described in qualitative terms. 26 The question whether and to what extent NBS is allowed to produce soft impacts is much more controversial, as this concerns people's private lives and does not fit within the presupposed liberal constraints.

Hard impacts
Health is a 'hard impact' of NBS and is the least controversial value in the ethical debate on NBS. Wilson and Jungner's standard for screening programs (1968), which still shapes the debate about NBS panels, stated that screening is justified if it offers a significant health benefit that clearly outweighs the risks and side effects of screening. Some authors argue strictly according to the Wilson and Jungner criteria and claim that we ought only to disclose NBS results that produce a direct and immediate health benefit for children. 27 They thus impose limitations on the intrusion that NBS is allowed to have in the lives of people. Others add that extending the focus of NBS beyond health would make NBS more controversial, as parents may not want to receive information about untreatable diseases, risk information, late-onset diseases or carrier status. Consequently they may refuse to participate in NBS, meaning children with treatable diseases might go undetected. 28 While 'health' is the original and uncontroversial focus of NBS, there has perhaps always been disagreement as to how 'treatable' a disease needs to be to be included in NBS. 29 Some authors, such as Bailey and Wolf, argue that NBS should also return information about untreatable diseases as it enables early entry into intervention services that contribute to improvement of a child's condition. 30 Others argue that intervention services do not always improve the health of children, as physicians do not always have the required knowledge about rare diseases, which influences the quality of their decisions about what intervention should be administered, whether to restrict a child's access to costly treatment, or start palliative treatment. 31 Even if some children with untreatable rare diseases are well attended to, we should not assume this will happen for all children.
Others take a broader perspective on the benefits of the inclusion: early detection of children with these diseases allows for the studying of incidence, symptoms and effects of early intervention, and enables inclusion of a child in clinical trials. Therefore screening for untreatable diseases may yield health benefits for the child, as well as the entire future population of patients with the same disease. 32 Paul, however, criticizes the promise that research will benefit the child's health, pointing out that this line of thought mistakes research for treatment, and that no health benefit should be expected from research. 33 NBS can also disclose information not immediately relevant for the infant's health, such as information about carrier status, late-onset diseases or risks. Carrier status information, for example, will only become relevant for choices the child makes about his or her own reproduction.
For some authors this irrelevance to the child's health is sufficient reason to reject its disclosure after NBS. 34 Others argue carrier status information is of more immediate importance as it can inform parents about their own carrier status and their risk of having affected future children, and can allow them to make informed decisions about their further reproduction. 35 It is observed, however, that parents often do not understand or use carrier status information or misinform their own children when they grow up. 36 In addition, some authors argue against the inclusion of carrier status information in NBS on the grounds that NBS should not be used as a surrogate for carrier screening of parents for this exceeds the goal of NBS. 37 If parents want this information, they can ask a doctor and do not need NBS. 38 Arguments in favor of the return of risk information or late(r) onset diseases after NBS state that it helps to be more attentive to signs of disease, permitting swift action to prevent harm. 39 It enables parents, for example, to see symptoms of inherited diabetes 1 in time and avoid that their child will be diagnosed in an emergency setting, or it helps physicians to recognize symptoms of rare diseases they are unfamiliar with. 40 However, given the psychosocial harms of knowledge about

Soft impacts
Soft impacts are hotly debated and refer to outcomes of NBS that influence human socio-emotional wellbeing, such as psychosocial harms or benefits that families may experience when they receive information about risks, late(r)-onset diseases, or carrier status information. Benefits include a sense of relief to know that a particular child did not inherit a family disease, or empowerment of parents to make their own decisions about their future reproduction when they receive this information. 42 Disclosure of information about late(r)-onset or untreatable diseases also helps avoiding the so-called 'diagnostic odyssey'; a long and burdensome search for a diagnosis, which children with rare diseases often undergo because physicians have difficulty recognizing the symptoms and requesting the appropriate diagnostic texts. 43 Having a diagnosis of untreatable diseases has intrinsic importance, according to Botkin and Rothwell, who refer to empirical studies that suggest it helps parents to move toward acceptance of the disease and organize their lives around it. 44 Others are more critical of this soft benefit, arguing that shortening the diagnostic odyssey should not be the task of NBS; it can also be shortened if pediatricians' ability to recognize these diseases is improved. 45 Many authors also expect soft harms from the disclosure of untreatable diseases, late(r)-onset diseases, risk information and carrier status, as their disclosure can produce parental feelings of anxiety, stress and guilt, resulting in disrupted parent-child bonding, overprotection, damage to the child's self-esteem, and diminished wellbeing. Expected social harms include stigmatization or discrimination within the family or in society, which may lead to difficulties to form relationships later in life, make reproductive decisions, obtain insurance, buy a house, or find a job. 46 An issue particular to adult-onset diseases or risk information is medicalization of the healthy life of a child, or the creation of 'patients in waiting': people diagnosed with a disorder and 'waiting' for its symptoms to develop. 47 As children 'at risk' may be treated differently by parents, they can develop disordered illness behavior later in life such as excessive worries about health. 48 The uncertain nature of risk information may cause '(. . .) a type of social identity in which people are neither well nor ill, but "at risk".' 49 This knowledge might interfere with life plans, as it may medicalize nonmedical decisions about marriage, children, and career. 50 This debate reveals that NBS influences aspects of people's private lives, and raises the question which soft impacts NBS should produce (if any). Interestingly, some authors claim that NBS policymakers should not answer this question. As little is known about the actual occurrence of soft impacts, how parents evaluate them and cope with them, they argue parents themselves should determine the value of this information. 51 Botkin and Rothwell suggest, for example, to adopt a notion of 'personal utility', which refers to the use parents can make of disease information in their own lives. 52 They argue that parents should make their own private decision about the kind of disease information they want to obtain.
The term 'personal benefit' suggests that NBS offers information and individuals develop their own understanding of its benefits in their private lives. Some authors, however, speak of 'family benefits' since many soft impacts are difficult to individualize, such as the presumed benefit of an early diagnosis to help parents create a well-organized, stable, and caring environment for the child, benefitting the whole family. 53 Authors such as Forman and colleagues choose social terms to refer to these benefits; such as 'family benefits' because they think NBS helps families foster a caring relationship. 54 Rare authors, such as Ross and Knoppers, speak about 'relational duties' arising from the shared nature of genes, urging parents to warn blood relatives who may be affected, 55   Characterizing soft impacts as personal or family values allows to appreciate NBS' influence on people's private lives and raise the question how this influence ought to be shaped and limited. Most authors however say that parents should decide about soft impacts privately.
Considerations about parental duties are rare, as well as calls to involve a broad variety of stakeholders-including clinicians, researchers, ethicists, public health professionals, policymakers, and patients-in thinking about what/whose benefits should be the focus of NBS 57 or that the public of parents at large should be involved in establishing the goals of NBS policy. 58 3.1.4 | Dealing responsibly with results that are not included in the program Some ways in which NBS influences people's lives are beyond the control of NBS policymakers. A recurring theme in the literature is how to deal with results NBS does not aim for, such as false positives, so-called incidental, unsolicited or unanticipated findings, and uncertain or ambiguous test results and associated problems of overdiagnosis or underdiagnosis (see Table 2). Unexpected findings have been part of NBS since the beginning, but attract more attention at the prospect of introducing NGS in NBS, as this may lead to an increase in the number and variety of results not included in the program.
Insofar as these findings reveal untreatable variants of diseases, late (r)-onset diseases, risk information or carrier status, the issues addressed in the literature largely mimic the hard and soft benefits and harms brought forward in the previous section. 59 Uncertain findings, however, raise a slightly different set of problems, as a lack of knowledge about prognosis or effects of treatment makes adequate counseling difficult. 60 NBS may produce all kinds of information of unknown clinical significance as a by-product, especially once NGS is introduced. 61 Such findings do not clearly indicate that a child is diseased, nor that the child is healthy, thus complicating treatment decisions. 62 Treating the child as diseased may lead to harmful overtreatment, it can produce aforementioned psychosocial effects and adversely impact access to life-saving and costly medical interventions, such as heart or lung transplants. 63 But treating children as healthy comes with the risk of the child developing symptoms which early treatment could probably have prevented. 64 Additionally, some authors claim that results that are not included in the program may negatively impact parents' trust in NBS, as they do not anticipate these findings and may not want them. 65 Consequently they may refuse to subject their next child to screening, which would make NBS less effective in detecting affected children. Trust in NBS is therefore considered fragile in view of results that do not fit the NBS program, as they influence the private lives of people inadvertently.

| The manner in which the public is involved
It is typical for liberal perspectives that policymakers should refrain from influencing people's decisions about how they want to lead their private lives. This individual freedom is, however, restricted when the choices people make harm themselves or others. The debate about whether NBS ought to be mandatory or voluntary revolves around the question whether refusal of NBS justifies government intervention in personal choice. The main argument supporting mandatory screening is that society's obligation to promote a child's health supersedes parental prerogatives to choose and possibly refuse NBS. 66 This consequently sets 'high standards' for the program, as making NBS mandatory is only justified if it promotes the health of the infant. 67 Adding diseases whose early detection does not satisfy this requirement, as well as the possibility of findings that are not targeted by the program, thus immediately raise the question whether screening should become subject to 57 consent. 68 Information that does not immediately serve the health of a child should not be provided in mandatory NBS, according to some authors, as people may disagree about its desirability. In these cases, mandatory screening is not justified, and informed consent should be asked. 69 The most important arguments in favor of voluntary and informed participation in NBS include that NBS should respect autonomy, and that parents should have the responsibility for the healthcare decisions for their children. 70 Voluntary screening requires informing parents and asking their consent, which is expected to prepare parents for screening and to lead to their more active participation in NBS. This would motivate them to promptly take action in the case of a positive result after NBS, improving the effectiveness of screening. 71 Some authors even state that informed consent enhances trust in the healthcare system, for it fosters the idea of 'partnership' between parents and professionals in providing care for the child. 72 While arguments for mandatory and voluntary screening are in direct opposition, mandatory, and voluntary programs often do not differ much in practice. In mandatory NBS, parents are informed prior to screening and are allowed to opt out on grounds of personal or religious reasons. 73 And the uptake of voluntary and mandatory programs is equally high, causing some authors to argue that mandatory NBS is unnecessary if maximum uptake is intended. 74 The most pressing discussions in this context concern whether and how the arguments that traditionally supported voluntary or mandatory screening can continue to justify NBS when future screening technologies might disclose more disease information or results that are not included in the program.

| Difficulties related to mandatory programs
In contexts where NBS is mandatory, nowadays there is more support to make NBS at least partly voluntary. As expanding NBS programs yield more and different types of information, many authors believe that results exceeding the original conception of benefit (health) will influence so-called 'private' values, such as values concerning beliefs about child bearing, child rearing, family, and future reproductive decisions. They think parents should be allowed to make choices based on these values in their private lives and be given the opportunity to give or refuse their consent. 75 Several authors have argued for new models of participation, which make one part of the program mandatory, while making another part with no immediate benefit for the child optional. 76 Tarini and Goldenberg support this idea, but remark that '(. . .) parents may misunderstand the difference between mandatory and voluntary screening, and then may choose to forego screening for mandatory conditions '. 77 This can happen, because mandatory screening can still be refused, for example, on religious grounds. Ross is less afraid of this risk and instead proposes adopting an opt-out procedure for treatable diseases, allowing parents the possibility to choose while also nudging them toward consent, and an opt-in or more formal consent process for other conditions. 78 The advantage of such an approach would be that information is needed for both tiers and parental autonomy is respected, but in tier two more information needs to be offered to support parental consent.

Disadvantages are that new knowledge about diseases included in NBS
necessitates a continuous revision of the two tiers. Furthermore, screening for tier one diseases may occasionally identify diseases belonging to tier two, and healthcare professionals need to be welleducated about NBS to explain to parents the difference between both tiers. 79

| Difficulties in voluntary programs
In voluntary programs, expansions of the NBS panel increases the complexity and volume of information that needs to be provided to parents. 80 Informing is difficult for it needs to be done in a limited time, yet should be sufficient, and avoid being alarmist about diseases that will occur very rarely. 81 Information should be given when parents are 68 receptive to it, by knowledgeable healthcare providers who are able to attune information to the socio-cultural context of parents. 82 However, many authors warn that healthcare professionals may not inform parents well when NBS expands, as they lack knowledge about the rare diseases included in NBS, and the results that are not aimed for by the program, making it difficult to enable parents to give truly informed consent. 83 Parents, on the other hand, may be unable to grasp the information provided and their eventual consent may be perfunctory. 84 The introduction of genetic technologies will only increase these perceived problems of giving and receiving information. 85 To avoid an information overload for parents, authors discuss the type of informed consent procedure that should be adopted. Formal informed consent procedures require giving extensive information and asking for a signature from parents; more informal informed consent procedures allow informing parents in more general terms and giving them the chance to opt-out. 86 Some argue that generic consent suffices when NBS serves the health of babies, 87 others suggest parents should be offered the possibility to choose from a more differentiated 'menu of options' about which they need to be informed more extensively. 88 What model of informed consent is adopted depends, however, on the purpose of the program and its expected acceptance by society as well as on the potential findings that are not aimed for by the program. Some authors fear that these findings are detrimental to parental trust in NBS. 89 Others focusing on this problem of 'incidental' or 'unsolicited' findings, suggest that trust can be preserved if consent is asked for the disclosure of these findings too. 90 Authors opposing this idea argue that NBS should serve the infant's health; especially disclosure of incidental findings that are relevant to other family members is problematic as it infringes the right not to know of these family members. 91 Another group of authors suggests making a distinction between different kinds of information: they say, for example, that only incidental genetic variants which point to serious and actionable health problems should be disclosed. 92 In all these reflections, however, what is negotiated is how the personal and private choice of parents about their use of NBS for the care of their children ought to be fostered by means of information, even if NBS offers them an abundance of (sometimes unexpected) results.

| CON CL U SION AN D D IS CU SSION
Our analysis of the literature yields an overview of the issues and values that play a role in the discussion, which we presented in Table 3.
The most striking result of our analysis is that anticipated expansions of the NBS program beyond its original focus on health improvement for children, lead to more calls to make participation in NBS (at least partially) voluntary. As mandatory screening rests on the argument that the state may act paternalistically if that would protect the health of babies, the support for mandatory screening diminishes when expansions of NBS impact values that concern not only the protection of health, but also choices that people make in their private lives.
This connection between the justification of the NBS program and the growing support for voluntary NBS, is in our view indicative of the liberal presuppositions figuring in the background of the ethical debate about NBS. Liberals generally separate between issues that belong to the public domain and should be decided on by policymakers, and private issues that are the object of informed consent. 93 Naturally, liberals also disagree about where to draw the distinction between public and private realms, allowing for narrower and broader understandings of the responsibilities of policymakers. Its narrowest conception only allows the state to exercise power over individual citizens if 'it is to prevent harm to others'. 94 In line with this approach, some authors argue that state power to mandate NBS is justified if this protects the health of children, but they oppose mandated NBS when it influences not just health, but other aspects of private life.
Relegating some issues to the private domain, however, may also function as an effective discussion stopper. Hard impacts such as health are considered the responsibility of policymakers in the public domain. These impacts on health are backed up by scientific evidence that provides quantified justification for the benefits of NBS. While there is disagreement about the convincingness of this evidence, focusing the ethics of NBS on impacts on health at least reduces these disagreements and makes them more manageable as including the disease in NBS will enable more research and will allow providing more evidence in the future. 95 Soft impacts, by contrast, invite a lot of 82 disagreement that seems a lot more challenging to manage; as the literature shows, authors disagree as to whether they occur, how they should be evaluated, and by whom. More research will be unlikely to settle these disagreements as it will only allow one to acquire an empirical overview over the values that parents and professionals generally hold dear, but research remains silent about what values an NBS program ought to pursue or foster. Assigning responsibility for soft impacts to the private domain, removes these controversial topics from the public arena and burdens parents with them.
This division of ethical labor mimics what happens in many other ethical debates, about new technologies for society; hard impacts are often considered worthy of policy concern, while concern for soft ones is delegated to the private domain. 96 The downside of this division of ethical labor is, however, that parents are charged with quite a difficult task for which they receive little support. The NBS literature shows that it is hard to provide the necessary information to help parents make an informed decision. Professional ethical reflection does not help them to decide either: ethicists do name the issues that may occur in people's private lives, but restrict their ethical reflection and argumentation to the policy decisions. Parents therefore have to make their choices without the support of ethicists who are trained in ethical reflection and who could therefore be expected to enhance their reflection and give it more substance.
In our view, soft impacts caused by NBS deserve more attention in ethical reflection, as they offer possibilities whose value for the care of children should be taken into account. One of the ways to achieve this is by means of fostering a dialogue in which parents of healthy and diseased children share their experience when they obtain different kinds of health information and explain how it is valuable, or not. This allows them to broaden the limited scope of their own experience and enhance their reflection on what good care for their children consists in and how NBS can and cannot contribute to it. Such a dialogue, furthermore, should be coupled with the development of a more substantive evaluative language which exceeds risks, benefits, and harms that dominate ethical reflections about NBS. Our review allowed us to encounter such substantive terms in the work of authors who tentatively use a relational vocabulary ('family benefits', 'caring bonds', 'trust', 'solidarity with future patients') to convey a message about what may be gained if NBS is allowed to give information that can be used to strengthen and foster caring relationships-such as when information about untreatable diseases allows parents to respond to the needs of the child, organize professional care, and seek a new equilibrium in their family (including other siblings) as well as their jobs and extended social network which suits everyone's lives, joys, and ambitions.
While terms such as 'social benefits', 'care', 'trust', and 'solidarity' suggest a communitarian or care ethics perspective on NBS, it has never been developed further to supplement the predominant liberal perspective on NBS. Some authors such as Françoise Baylis and colleagues have suggested developing a feminist relational approach to public health ethics, but focused primarily on vaccination programs as an example. Using notions such as solidarity, reciprocity, mutual dependency, and relational autonomy, they argue that individuals depend on each other to become and stay healthy and autonomous decision-makers. Public health programs such as vaccination would, in their view, be difficult to defend without a proper grasp of how people are related: the meaning of 'public interest' and 'common good', which ought to be the focus of public health programs, requires understand- The dependency of newborn children on their parents' care, the blood relatedness of family members and disease inheritance within a family, as well as connectedness of a patient to distant (future) others with the same (rare) disease, provide a lead to rethink what the common good is and what solidarity would accordingly require in a context where technologies are able to provide an abundance of information about the health of an infant. It would go beyond the scope of this article to actually elaborate such a social perspective to the common good in NBS, but we listed the questions that we think are a valuable starting point for its development in Table 4. These questions invite empirical research and theoretical reflection on the meaning and normative content of concepts such as care, trust, and solidarity in the context of an expanding NBS program, as well as on whether and how NBS policy can continue to respect the distinction between the public and private domain. This work would enhance the debate about NBS, which is nowadays hampered by the liberal choice to delegate the responsibility for very difficult issues to parents in the private domain.

CONFLICT OF INTEREST
The authors declare no conflict of interest.