A new study finds the more time a baby spends in the womb, the better off they are.

FOX News Radio's Pam Puso has more:

It's an argument against scheduling a C-section out of convenience.

Researchers say more time in the womb may matter when it comes to brain development. Even for infants who are born full-term, generally between 37 and 41 weeks.

A study of more than 100,000 New York City school children who were born at 37 or 38 weeks found they didn't perform as well on third grade math and reading tests as children born a week or two later.

The study in the journal, 'Pediatrics' was published online.

Pam Puso, FOX News Radio.