Effects of prolonged and exclusive breastfeeding on child behavior and maternal adjustment: evidence from a large, randomized trial

Abstract

Effects of prolonged and exclusive breastfeeding on child behavior and maternal adjustment: evidence from a large, randomized trial . Kramer, M. S., Fombonne, E., Igumnov, S., Vanilovich, I., Matush, L., Mironova, E., Bogdanivich, N., Tremblay, R. E., Chalmers, B., Zhang, X. & Platt, R. W. , for the PROBIT study group ( 2008 ) Pediatrics , 121 , e435 – e440 . DOI: 10.1542/peds.2007-1248 . Objective The objective of this study was to assess the long-term effects of breastfeeding on child behaviour and maternal adjustment. Methods We followed up children who were in the Promotion of Breastfeeding Intervention Trial, a cluster-randomized trial of a breastfeeding promotion intervention based on the World Health Organization/United Nations Children's Fund Baby-Friendly Hospital Initiative. A total of 17 046 healthy, breastfeeding mother–infant pairs were enrolled from 31 Belarussian maternity hospitals and affiliated polyclinics; 13 889 (81.5%) were followed up at 6.5 years. Mothers and teachers completed the Strengths and Difficulties Questionnaire and supplemental questions bearing on internalizing and externalizing behavioural problems. Mothers also responded to questions concerning their relationships to their partner and child and their breastfeeding of subsequently born children. Results The experimental intervention led to a large increase in exclusive breastfeeding at 3 months (43.3% vs. 6.4%) and a significantly higher prevalence of any breastfeeding at all ages up to and including 12 months. No significant treatment effects were observed on either the mother or the teacher Strengths and Difficulties Questionnaire ratings of total difficulties, emotional symptoms, conduct problems, hyperactivity, peer problems, or prosocial behaviour or on the supplemental behavioural questions. We found no evidence of treatment effects on the parent's marriage or on the mother's satisfaction with her relationships with her partner or child, but the experimental intervention significantly increased the duration of any breastfeeding, and mothers in the experimental group were nearly twice as likely to breastfeed exclusively the next-born child for at least 3 months. Conclusions On the basis of the largest randomized trial ever conducted in the area of human lactation, we found no evidence of risks or benefits of prolonged and exclusive breastfeeding for child and maternal behaviour. Breastfeeding promotion does, however, favourably affect breastfeeding of the subsequent child.