My 3 month old baby suddenly doesn't like to take naps. Even if he does nap, he will wake up 15 to 30 mins later and he will keep yawning and scratch his head and ears. Obviously he is tired but it is just so hard to make him sleep. I hope he can at least sleep 3 hrs during daytime. But adding up he is not even sleeping 2 hrs. It's very tiring to keep making him nap. Is this just a phase? What can I do because I'm afraid he will be over tired.