Birth order and postpartum psychiatric disorders
Article first published online: 31 OCT 2013
© 2013 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd
Volume 16, Issue 3, pages 300–307, May 2014
How to Cite
Birth order and postpartum psychiatric disorders. Bipolar Disord 2014: 16: 300–307. © 2013 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd., , .
- Issue published online: 5 MAY 2014
- Article first published online: 31 OCT 2013
- Manuscript Accepted: 18 MAY 2013
- Manuscript Received: 30 AUG 2012
- Lundbeck Foundation Initiative for Integrative Psychiatric Research
- bipolar affective disorders;
- birth spacing;
- postpartum psychiatric disorders
Primiparity is a well-established and significant risk factor for postpartum psychosis and especially bipolar affective disorders. However, no studies have, to our knowledge, quantified the risk of psychiatric disorders after the first, second, or subsequent births. The overall aim of the present study was to study the risk of first-time psychiatric episodes requiring inpatient treatment after the birth of the first, second, or third child.
A cohort comprising 750,127 women was defined using information from Danish population registries. Women were followed individually from the date of birth of their first, second, or third child through the following 12 months over the period 1970–2011. The outcome of interest was defined as first-time admissions to a psychiatric hospital with any type of psychiatric disorder.
Women who had a first psychiatric episode which required inpatient treatment after their first (n = 1,327), second (n = 735), or third (n = 238) delivery were included. The highest risk was found in primiparous mothers 10–19 days postpartum [relative risk (RR) = 8.65; 95% confidence interval (CI): 6.89–10.85]. After the second birth, the highest risk was at 60–89 days postpartum (RR = 2.01; 95% CI: 1.52–2.65), and there was no increased risk after the third birth. The effect of primiparity was strongest for bipolar disorders.
Primiparity is a significant risk factor for experiencing a first-time episode with a psychiatric disorder, especially bipolar disorders. A second birth was associated with a smaller risk, and there was no increased risk after the third birth. The risk of postpartum episodes after the second delivery increased with increasing inter-pregnancy intervals, a result which warrants further investigation.