Researchers followed 1,000 children in Australia. They found that by age 10, boys who had been breastfed for at least six months had higher test scores than those who didn't nurse as long.
For some reason girls did not show the same improvement.
The study in the journal Pediatrics notes mothers who breastfeed tend to be more intelligent and better educated. Those advantages may also account for a child's superior development.
Still, they say all mothers should be encouraged to breastfeed for at least six months.
