To find out whether breast-milk feeding contributes to the intellectual development of children,psychologists used

Question

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In order to determine whether breast-milk feeding contributes to intellectual development, it is necessary to conduct an experiment in which some infants are breastfed and others are not, and then compare their intellectual development over time. This is the only way to establish a cause-effect relationship between breast-milk feeding and intellectual development. Case studies, surveys, and naturalistic observations would not provide this level of experimental control, and would not allow for the same level of certainty in determining causality.

To Find Out Whether Breast-Milk Feeding Contributes to the Intellectual