depression

A lot of men struggle but don't like talking about it! It's important he understands he isn't alone in his feelings, men don't often bond with their children until from the age of 6. Be supportive and reassuring and encourage him to support his wife and not worry too much about the baby, it will come to him in time.

ps -
www.webmd.com/depression/postpartum-depression/news/20080506/men-also-get-postpartum-depression#1

I agree, very sad and worrying. Did your son tend towards depression before the baby was born?
His feelings are almost like those of some women after a baby is born - post-puerperal depression. As if he was identifying with his wife. Plus enduring sleepless nights.
I'm sure he can be helped with the right treatment.

Has he seen his GP yet?

How sad and worrying for you. It sounds like he needs professional help. His GP should be the first port of call.