14: November 25th
So there aren't very many births on November 25th, it probably is too close to Thanksgiving and doctors don't want to be delivering babies! It apparently wasn't a problem for former President George W. Bush, as his wife had fraternal twins on this day!
13: December 23
The song goes "Santa Claus is coming..." not a baby!
12: October 31
Having a birthday on Halloween makes planning your party easy: It's going to be a costume party!