A.C.
My daughter did the same thing. After awhile I got use to it and let her stay on her tummy. I know she was not out of the SIDS danger age, but she already knew how to flip on her back from her tummy. I would be more concerned if he is sleeping with a blanket at 4 months old than flipping over. At that age my daughter could wrap the blanket around her neck! But I know I was a little uncomfortable when my baby flipped to her tummy at first too while she was sleeping. After she was rolling in sequence I started laying her on her stomach all the time. I know other mom's who put there newborns on there stomach and I don't think that is too bright. SIDS has been reduced by like 70% because of the back to sleep campaign. Congrats on being able to Stay at home!