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Sociologists have been studying the hypothesis that the long-term superiority of breast-feeding could be due to socioeconomic factors and disparities between mothers and children who do and do not breast-feed, rather than from breast-feeding itself. To examine this possibility and account for unmeasured differences that might affect outcomes, researchers used longitudinal data collected between 1986 and 2010 to compare outcomes in a subset of 1773 siblings (mean age, 9 years) from families with one child who breast-fed and one who did not.
In the full sample of 8237 children, children who were breast-fed had significantly better measures of body mass index, obesity, hyperactivity, parental attachment, vocabulary, reading, math, Wechsler Inte…