According to a recent study, babies who were breastfed exclusively for at least the first three months of life scored higher on IQ tests at age six than children who weren't breastfed exclusively. Previous research has shown that breastfed babies had enhanced thinking, learning, and memory abilities.

Researchers aren't exactly sure what the link between breastfeeding and IQ is. It could be a nutrient in breast milk -- perhaps the amino acids or cholesterol that's found in breast milk but not in formula. Or it could be the attachment-inducing act of breastfeeding.

The researchers of this study recommend breastfeeding exclusively for at least three months, though six months to one year may have added benefits.