What the hell? Is it because babies born during the sunny, awesome spring months get the false idea that the world always looks like that, then six months later get bummed out by everything turning dead and brown? Because you'd think that they'd get over it after a few cycles. If there's a genetic component to it, what does that mean -- that depressed people are more fertile from August to October? That people with schizophrenia all start boning in April and May? We'd have heard something about that, wouldn't we?
The reality is that nobody is really sure what causes it. The researchers believe that it might have something to do with temperature, which can affect the way brain cells are arranged in a developing fetus. Babies are not microwave-safe, nor can they be kept in a refrigerator, but children born in the spring have experienced both extremes during their nine months in the womb. Or maybe it's that pregnant women eat different diets during the winter months, or that less time in the sun affects vitamin D levels. Or maybe it's, like, astrology or something.