This thread scares me - I've joined just to post this comment. I understand you are frightened and probably shell-shocked and feel completely trapped. You don't know where the man you love has gone and a life in 'care' has probably left you feeling authority can not be trusted, that you are somehow 'wrong' and that you will not be believed. I'm not going to repeat the advice you have already had. But you are in a very dangerous position.
Unfortunately your bf is tapping into your feelings of being worthless and not being believed. If we were to say that his hitting you was partly your fault and he's a decent guy then he would not be telling you that leaving means your baby will be taken. He would not be telling you how he will tell everyone you hit him - the fact that he's saying these things means he's a very dangerous man indeed. If it was just him losing his temper in an argument he would be horrified and would probably move out to get some space. He wouldn't be making you terrified by telling you a pack of lies to control you. Because it is a pack of lies.
Abusers also control your money and your support network - they make sure you have neither. They get their hands on everything you earn/all benefits and they convince you that you can't trust anyone. Is this the case for you?
Recently there was a lady on here who got help leaving with several children. She had nothing. She rang women's aid (took several weeks) and was offered a place at a refuge. She managed to get a tiny bit of cash put away and they told her how to get benefits given to her. She loved the refuge. Made friends, her kids were happy, and she has just moved into her own council flat. He's in the military and would have told all kinds of lies but he wasnt believed - because they all say these things and the authorities can spot it a mile off.
You can do it too. There's the book 'why does he do it' (free) and you can phone women's aid. Talk to them. Find out your options. They will believe you and you will be safe once you leave.
All abusers say they will get full custody, no one will believe you, you will have the children taken etc. They ALL DO IT. Read the book, you'll see who he is snd you'll see what he will do - and you will stop blaming yourself.
If you will stay he will make sure you are less able to leave. More children. Not being able to work. No friends or support. And if you think you are depressed now believe me it can get worse. Start planning, put little bits of money away, get documents out, get another phone, talk to women's aid. Act like nothing is wrong but see your gp and report this - it's confidential and you probably need medical help (anti depressants). Talk to your health visitor too. Women's aid will support you and you will NOT have your baby removed.
This is your best opportunity- in a month you could be safe and happy. Plan now to get out with what you need and get it all lined up. Then when he's out or at work go. Leave a letter explaining you needed to get out, that you felt it had become an 'abusive situation' and wasn't 'right for anyone'.
Because he is one dangerous man. This is a lot of very extreme violence in a very short period of time. It's usually much slower to start and further apart. I do think he will destroy you completely if you stay for even six more months.