According to a new study from Dartmouth College, boys born in January, February or March are more likely to play in the NFL than boys born in any other month.

Researchers found that players born in these early months develop faster than other — slightly younger — players.

It seems that being just a bit older gives these boys a bit of an edge on the playing field. And, this slight edge also probably gives them a boost in confidence, which can be enough to carry them right to the pros.