Lol....all of my kids had some sort of tragedy or natural disaster around their birthday. My very spirited little girl was born the day Hurricane Katrina hit- but and far as causing labor, I imagine that's mostly a coincidence. That being said, my mom worked nights as a nurse for 25 years and DReADED working on a full moon because she said it, "brought out the crazies!"
It has to do with the moons gravitational pull on bodies of water.