Any idea why a 2months old grunts while sleeping. He makes this sound even when he is awake. He grunts more after being fed. He is also crying and throwing his hands in air while sleeping. This action is not what he does when he gets scared while asleep. He makes sound as if he is putting pressure to poop but he isn't pooping. He has developed this after he had upset stomach and was passing wind a lot and with difficulty. He has too much of gas. Everytime he passes gas in sleep he wakes up and cries. These issues mostly starts in evening. He doesn't sleep sound.