My DD is a tummy sleep now too. I worried about it at first and had the motion sensor thing on, but like the others have said, if your little girl can lift her head she'll be fine. I just accept now that Izzy will be on her tummy within 3 seconds of being in her cot. I'd definitely move the anti-roll thingy though and stop wrapping her too - wrapping might get her a bit tangled up.