Long-term study finds that IQ at age 30 was nearly 4 points higher for babies breastfed for a year or more . Study conducted in Brazil also associates longer breastfeeding with higher income and education levels . Comment:
Long-term study finds that IQ at age 30 was nearly 4 points higher for babies breastfed for a year or more . Study conducted in Brazil also associates longer breastfeeding with higher income and education levels . Critic points out that the study does n't account for other possible contributing factors .