My little girl is just about 5 months old. She is confident on her tummy during the day and can hold her head up and lift herself up on her arms fine. She has just started to roll over from her back to her tummy but can't roll back the other way yet. Trouble is she has started rolling onto her tummy at night. Last night I rolled her back onto her back twice but she flipped back again when I was asleep. She seems comfy on her tummy and so far has turned her head to the side. But I am worried sick that she will suffocate herself! There is only a fitted mattress sheet on her cot - no bumpers or blankets. But still I am worried. If I see she is on her tummy I flip her back but I can't stay awake all night. Should I worry? I am giving her plenty of tummy time and trying to tea h her to roll back onto her back. Thanks!