Don't get depressed. Sound like some stuff that should be checked by a good therapist. Guys can feel left out and not a part of the whole process of birth. Women get post-partum depression. And some women have trouble adjusting to being a mother.
Men can have the same problems.
Think about it, here's this little baby that is now getting all of your attention. If he's still there, good. It sounds to me as if he's starved for attention. Attention from you that is now going to the baby. If plan A alone doesn't seem to help, then get yourselves into a marriage counselor.