I just read the "what happened" part. You need to tell your husband that your opinion counts too and that there's no way he can break a deal without you being on board, especially when it's YOUR mother you are talking about, not even his!It sounds like you didn't exactly find your soulmate here...I am sorry, but do what you can for now and focus on BEING HEARD. You can shut your mom out but you can't do it with your husband.
At this point I would rebel to him. No rules concerning yourself or the baby can be made or broken without your approval. He is not doing his duty as as a husband/spouse (no support here!) - I wonder if it can be a reason for annullment of the marriage? Just something to think about for the future.
I am sure you'll get many words of encouragement here, so an idea could be to print them and let her hear them - so, first off, she can't say that it's only your view of the situation. Secondly, everybody knows that there is a time and a place for intervening in other people's life. You needed her and she was there for you, but if now it's the time to step back and let you handle your motherly duties, she definitely should. If her initial purpose was to support you, to help you, even to teach you a little bit, then she should know that you are ready to take over now. If she doesn't think so then tell her that you will always be grateful, that you will rely on her again in the future as needed because you value her inputs, that she did such a great job infact now you are perfectly able to take over by yourself. If, on the other hand, she just felt entitled to do it all and forever because she has a low concept of you, then, there's not better way to prove her wrong by taking over and raise a healthy, happy baby, that she can enjoy and spoil as a nana. She is not her mother, at some point she needs to let this baby go.