I think we should have named this child "tigger" instead of "tyler".  As soon as we lay him down on his back, he immediately flips over.  I swear he must have springs in his butt!  At first I was worried about him sleeping on his stomach because of the risk of SIDS, but everyone I've talked to (and everything I read) says that once they can flip over on their own, don't worry about them sleeping on their belly.  Plus, when it comes down to it, there really isn't anything I can do about it, short of strapping him down at night...