OP please realise that you are not the problem here.
Yes, it seems like you raised your voice, maybe shouted at your DH. It’s not ideal, but assuming it was a one off incident you have already apologised much more than was necessary for doing that.
If you had yelled at the top of your voice that your DH was the son of a syphilitic
whore, and had a tiny cock, it would not have justified him threatening you with physical violence.
He is bullying you, and by constantly apologising you are possibly making him feel vindicated about his yelling and threats.
From the limited details included in your opening post it could be that he is looking for a reason to ‘correct’ you, and he will find one even if it exists only in his head. You seemed VERY sure that he wouldn’t apologise, so it’s obviously not the first time something like this has happened.
How long can you tread on eggshells before his threats turn into actions?
Please think about your safety, and that of your child.
How can you be with a man who threatens you and then expects you to apologise again to him?