Several studies suggest that breast-fed babies become more
intelligent children than formula-fed babies. One such study
(Mortensen, Michaelsen, Sanders, & Reinisch, 2002) involved a
sample of over 3,000 women and men born in Copenhagen, Denmark,
between October 1959 and December 1961. The samples were divided
into five categories based on duration of breast-feeding, as
assessed by physician interview with mothers at a one-year
examination. The child’s intelligence was assessed using the
Wechsler Adult Intelligence Scale (WAIS) at a mean age...