i agree that maybe suggesting he read one of Pinky's books could be helpful, or a great one is 'The Science of Parenting' as well. my dp was the same at first (and his mother too!) but this book has been really helpful.
Yes! I was going to suggest buying or borrowing The Science of Parenting. Read him the page on what extended periods of crying (if the baby is left alone) does to their brain chemistry. It is explained in a way a guy would understand. It is plain simple cause and effect. Highly highly recommended!