My 3 week old son is completely content just laying in his pack n play looking around and moving his arms and legs. This is only after he is changed and fed of course, and if he is still awake. The thing is, I feel bad not holding him/interacting with him. I don't leave him in there for long and if he cries I immediately pick him up. My question is...is this normal? Is it good for him to have some quiet alone time or should I be constantly holding or interacting with him when he's awake?