Op my lovely , I've just this morning read your full thread. 
Right. It's YOUR house. so DO NOT let this bastard back in. Pack all his gear put it outside the door then text him to come pick them up. Where he goes from there is his problem.
He's been terrorising you both verbally, emotionally, and now the physical side is ramping up - first the door, then you next. He's a low-life bullying bastard who thinks he's a big man because he gets to shout at and threaten a vulnerable woman who's just given birth. Well, he's not, he's a coward.
All that bluster about expressing so that he can take the baby to see his mum and dad is pure guff - he simply wants to dump the little one on them for a while, and get to punish you at the same time.
Did I mention he's a bastard? Well, he is. I've been there, and know this scenario so well.
Photo the damage he's caused, and as all PPs have said, call the police, get it on record.
I know you're worrying about being lonely and coping on your own. Well it's hard, but you can. I did.
The first night as a single mother in my own home, with the doors locked, knowing no one could come in the house if I didn't want them there was wonderful.
Please, for the sake of your baby, yourself and your dog, don't take him back.