The Effect of Breastfeeding on Children's Cognitive and Noncognitive DevelopmentThis paper uses propensity score matching methods to investigate the relationship between breastfeeding and children's cognitive and noncognitive development. We find that breastfeeding for four weeks is positively and statistically significantly associated with higher cognitive test scores, by around one tenth of a standard deviation. The association between breastfeeding and noncognitive development is weaker, and is restricted to children of less educated mothers. We conclude that interventions which increase breastfeeding rates would improve not only children's health, but also their cognitive skills, and possibly also their noncognitive development.
IntroductionThis paper examines the relationship between breastfeeding and children's later cognitive and noncognitive outcomes. This is a topic of considerable importance for policy in the UK: the World HealthOrganization recommends breastfeeding exclusively for six months and alongside solid foods for two years, but in the UK, barely one in three infants is exclusively breastfed during the first four months of life. Given the increasing recognition of the importance of very early interventions in children's development and later outcomes; and given the huge social gradient in breastfeeding rates, with the most privileged mothers currently being many times more likely to breastfeed than the least privileged mothers, breastfeeding may well be a significant route for the intergenerational transmission of human capital. Recent research shows a significant impact of behavioural and psycho-social outcomes on earnings and education (Duncan and Dunifon 1998;Heckman et al. 2006;Mueller and Plug 2006). Differences in children's cognitive development emerge at early ages (Illsey 2002;Feinstein 2003;Cunha et al. 2010), and the importance of timely parental investments (prenatal as well as post-natal) is increasingly recognized as a major factor in fostering child development (Carneiro and Heckman 2003;Del Bono et al. 2008). A fuller understanding of the relationship between breastfeeding and various aspects of child development is therefore crucial for an understanding of the intergenerational transmission of inequality, and for policy-making aimed at reducing inequality.There is a well-established association between breastfeeding and a range of positive health outcomes in children, such as a lower incidence of asthma and middle ear and urinary tract infections (Dyson et al., 2006). A smaller body of research also shows breastfeeding to be related to better gross motor development (Sacker et al., 2006), and improved cognitive ability (Anderson et al., 1999). Other potential effects of breastfeeding, such as cognitive and noncognitive outcomes of the type investigated here, are much less well * This paper has benefited from comments provided by participants at the British Society of Population Studies and at the 5 th conference of Epidemiological Longitudinal Studies in Europe; from ...