Why on earth would you want to be with a man who acts like this towards you???
Don't deceive yourself that it's 'only when he's drunk'. Being drunk sounds like an integral part of his personality.
You can't change him.
You can't get him to the point where he will seek help.
You can do nothing for him.
The only people on earth you can do anything for are yourself and your baby.
Sounds like he's a potential stalker too.
I think you should remove yourself from him and have no contact with him until he has cleaned up his act. On his own. Ditto for the baby - don't endanger the child. He can see his child when he can act like a responsible, nonviolent, sober adult.
Cruise the posts, you'll see your same story over and over again with different names. You can see how others have handled it and how that worked for them.