Tummy Sleeps

The last few days McKay has started to roll over from his back to his belly with no problem...the problem is trying to get back onto his back.  He can't seem to figure it out and gets stuck.  The crib and nap time are the best times to practice I guess.  He has started to play a lot in his crib at night and has been rolling onto his stomach and falling asleep. It really freaked me out at first and I rolled him over a couple of times but he has been sleeping most of the night on his belly and he seems comfortable.