ABSTRACT: The problems and concerns of breastfeeding mothers during the first six months after the baby's birth were studied to analyze factors that influence the duration of breastfeeding. Two observers visited 78 primiparae at 55 to 70 hours, two weeks, one month, two months, four months, and six months postpartum. After a structured observation during feeding, mothers were encouraged to ask questions and express their breastfeeding concerns. Results showed that most problems arose at two weeks and at one month, then slowly decreased over the next three visits. Common problems during early visits dealt with the establishment of a satisfactory breastfeeding routine; later questions centered on introduction of solid foods and management of work and breastfeeding. Another interesting finding was the large percentage of mothers still breastfeeding at six months (65%) and the relatively late introduction of solid foods to the infants. These results suggest that adequate professional support might increase the success and duration of breastfeeding.