There's overwhelming consensus that breast-feeding is the optimal way to feed an infant. But the topic of how breast-feeding may influence cognitive ability is controversial. Guerilla/Getty Images hide caption

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The Salt

Breast-Fed Kids May Be Less Hyper, But Not Necessarily Smarter, Study Finds

Prior research points to an association between breast-feeding and higher intelligence, but a new study finds no causal link. The study does find that breast-fed kids are less hyperactive at age 3.