Heavier Babies Do Better in School (perhaps more vitamin D)
Heavier Babies Do Better in School New York Times
A few quotes from New York Times article
Among the top 5 percent of test scorers in elementary school, one in three weighed at least eight pounds at birth, compared with only one in four of all babies.
The relationship between birth weight and test scores was present by the time children enrolled in kindergarten and remained fairly constant throughout elementary and middle school.
Other research has found that children who do better in elementary school are more likely to graduate from college, earn more as adults and live longer.

See also VitaminDWiki
Higher vitamin D at birth associated with less diabetes and obesity 35 years later – Jan 2014
Delayed scholastic achievement associated with low vitamin D levels – Aug 2012
(Stunting OR “low birth weight” OR LBW OR preemie OR preemies OR preterm) 376 items as of Aug 2014,
Low vitamin D increased probability of low birth weight by 60 percent – meta-analysis June 2012