The effects of breastfeeding on cognitive and neurological development of children at 9 years
Breastfeeding was not associated with any crude IQ advantage or difference in neurological soft signs in children at 9 years. The greater IQ score associated with breastfeeding is accounted for by confounding, with maternal and socio-economic characteristics particularly important.
from Child: Care, Health and Development
Posted on February 24, 2010, in Research and tagged breastfeeding, cognitive development, IQ. Bookmark the permalink. 1 Comment.

A study published in the American Journal of Clinical Nutrition testifies that breastfed infants scaled 5.2 IQ points higher than formula fed infants, was a comprehensive study involving over 7000 children. Infants deprived of breast milk are likely to have lower IQ levels, lower educational achievement, and poorer social adjustment than breast-fed infants.
http://www.iqtestexperts.com/iq-breastfeed.php