My DD just started doing this at 15 wks. It scares me at night 'cause she'll wake up, roll all around and end up with her face planted in the matress. We started using our video monitor so we can make sure she's not face down and I always go in and put her on her back again. I don't worry too much, I figure if she was going to die fo SIDS it probably would have happened already, seeing as we used to co-sleep and some nights she would end up face down in my arm! She can hold her head up really well, so I know she would do so rather than suffocate, but I stil make sure to turn her over when I catch it.
at 3:49 PM on Jun. 16, 2009