So it's happened! LO can roll on her tummy and she did it right before she fell asleep for her nap. I turned her on her side before I left because the nanny was nervous with her sleeping on her tummy on her watch. When did you let your LO stay sleeping on their stomach once they were rolling on their own? She can roll both ways although sometimes she forgets if she's cranky. Also she sleeps in a Zipadeezip so she is mobile enough. I felt like I read somewhere that the first week they learn to roll to their tummies to flip them and after that first week let them do their thing (but put them to sleep on their back to start), but now I feel like I made that up...