i havent read any of the replies but the first thing that came to my mind was post partum depression.. and yes… men can get it too 
talk to him… leave the baby with the in laws.. go out… and talk casually.. adn get it out of him … i never saw my husband cry nor be weak.. but as soon as my son was born he was a crying machine overwhelmed by emotions and god knows what else…
at first i didnt know what was goin on with him and to be honest, didnt have the time to care cuz i was soo bz with my newborn… but im glad we got it sorted out fast cuz it was getting to me…
so who knows.. maybe ure husband feels left out, stressed at becoming a first time dad and no one is bothering to talk to him bout how he feels… do it