My son is seven weeks old today and I've been noticing he has been rolling from back to side a few nights in a row and more recently like tonight he had rolled from his back to sleeping on his stomach...i slept for 4 hours after I put him down from his first bed time feed to wake and find him on his tummy. He has been eating more/longer to for his first feed before we start our bed time routine. My question is if he rolls to his tummy in his own is this safe?? He's been having really greatbhead control since he was born practically and will pick up and hold his head up for long periods of time.