Even St Lundy says that it is possible for abusers to reform. BUT in very, very, very, very rare circumstances.
Some men are shits and do treat their partners abysmally, but when you tell them how hurt you are, how sad you are and how you really can't take it a second longer, these men can realise and change.
If you tell an abuser all of the above, he will not stop, he will actually intensify it somehow.
If a man is genuinely abusive, then NO, barring a miracle, they will not change.
The best way is to treat them as if they won't, kick them out, and remove all forms of support from them, ideally their own family will side with you to, then, in these rare circumstances some men who abuse their P's may change.
The longer you leave it, the more you will be trapped. Get out and see how you feel. With a small baby, it'll be easier tbh, Please? do this for yourself? for your baby?