My son is 4 months old, he can roll from back to belly but cannot do belly to back yet. He sleeps in his crib with tight sheets only and I always put him to bed on his back since day one and sleeps amazing! So thankful. But now that he’s learned to roll from back to belly he is now doing it in his sleep and now belly sleeping which freaks me out because he will put his face down straight into his mattress.. he does great during tummy time, lifts his head, always doing things to help stretch those muscles! Whenever I check on him I will roll him back to his back and within two minutes he’s back sleeping on his belly, totally freaked out… I don’t know what else to do, I feel like I’m not sleeping at all.