Babies born in March have the highest autism rate, and black children have higher rates than whites, due to (if the theory is true) vitamin D production being l

Babies born in March have the highest autism rate, and black children have higher rates than whites, due to (if the theory is true) vitamin D production being lower in blacks due to high melanin content in the skin. There are several other data points in the study -- it's a good read, albeit quite technical. I'm still pre-med, so much of it is above my head.