Hello and welcome to Psych Central!

I am sure you are not alone in your situation. Many women find themselves in such circumstances. Have you tried to talk to your husband about how upset you are? What is he doing or not doing that's making you want to leave him?
Can you see a therapist to talk about the situation? Would he go to marriage counseling? If not, then I suggest you go by yourself.
I am thinking the two of you just didn't know each other well enough. Plus a baby early into a marriage makes the situation tougher.