Now that my DD is mobile I let her sleep however she chooses. If she falls asleep on her tummy I leave her there. If she falls asleep and I put her to bed I always put her on her back but when I put her to bed awake she will often move around in bed and fall asleep on her tummy. If they can hold their heads up on their own then I think the risk of suffocating is decreased. Once they're rolling, crawling etc they will sleep how they choose. I've never thought to move her once she's put herself to sleep a certain way.

