Please, OP,please, do not take on his guilt!
Lets be clear, its him abusing you, and yes, that IS abuse to the baby too. Any children witnessing abuse are classed as abused
You are bith being abused.
Do document it.
Never, ever lock yourself in the bathroom, upstairs.
Lock your husband out! Get out, but never trap yoirself in a room upstairs which he can just smash into and you are trapped as he is between you and the front door (exit/help)
Keep your phone in hand/pocket at all times. Male a silent call to 999 if anything happens, or if you are in fear that something is going to.
I repeat, never lock yourself in a bathroom!
Record all incidents to 101, and have a flag out on your home address and mobile/landline. This will put you on a priority call out if you call.
Both you and your baby are at risk, it is not one you can manage, but you do know him better than anyone else.
A man who's experienced abuse and has become abusive is a very dangerous man.
You are not to blame for this, he is, his guilt and services need to protect you, not blame you for being abused.
Abused women are often too terrified to do anything and make decisions to survive daily for their family and themselves which dont make sense to others and look like wrong thinking, but they keep you alive.
Start preparing, very quietly. If you can get away with it walk out the door as fast as you can, but only if you can get away with it.
If you have a friend or two who you can trust more than 100% not to speak about it, ask them for help too.
Every strength to you. Be safe.