While it's hard to prove, there is plenty of circumstantial evidence that 'baby booms' happen after major events (Super Bowl babies are an urban myth for a reason!) and holidays. And sure enough in some parts of the country there is a pronounced (ahem)...bump...in babies born 9 months after Valentine's Day.
Want to know the most popular month to be born in? You might just discover it's 9 months after another well known, widely celebrated holiday...