My daughter has me freaking out every night. She insists on sleeping on her belly, yet she doesn't know how to roll from her belly to her back yet. At least she hasn't proven that she will do it. Any suggestions on what we should do? I put her on her back, she flips right back over and jams her thumb in her mouth. She seems like she can breathe okay and she doesn't often wake up fussing to have us roll her over....

Is there really anything we CAN do now? She's 4 months old.