Yeah, its a phase. DD wants to roll around the cot more (she too gets stuck on her belly but just starting to roll from front to back.. so its passing! lol) when shes overtired.

When she began rolling and upwrapping herself I brought her a "wrap me up" swaddle. Check it out. Its meant to discourage rolling. Though that being said, DD has recently learnt how to roll in it but it does make it harder and she gives up after a while.
Yeah I have a wombie wrap but she just rolls in that too, I figure arms out is better than arms strapped down. We also have wrap me up swaddles and she rolls in those, and she rolls around out of her blanket wrap.

Gah