S.P.
Hi A.. I just emailed this same question on this site last month or so ago. My 5 mo daughter was doing the same thing in the middle of the night. she hated to be on her belly. You just have to go in and roll him back over or try to let him figure out how to roll back over himself. I know its hard but he will learn to do it. Now my daughter is 6 1/2 mo and when I go in to check on her she is sound asleep on her belly. Sometimes in the morning she will wake up crying because she is on her belly. I don't understand that cause she can roll back over now. Just give some time and you guys will be ok. Take care, S.