Communication is key here. Words might look like:
"Honey, something is bothering me. Do you have time to talk?"
"I feel weird. I miss intimacy. I miss making love. Is there something I should know?"
Or "I feel bad. When you say you think I hate you, I feel confused. I don't want to misunderstand. Can we talk about that?"
Or "I feel bad. I miss intimacy. My body has changed so much since the baby, and I want to feel wanted. What do you think?"
Rejecting sex is usually a sign of anger that's lingering underneath. The sex itself is not the issue, something else is going on. Find that "something else" and the sex will come back.
The trick here is to give him a safe place to talk. Maybe he just has a lower libido than you (which is fine) but the two of you have to work out something that works for both of you.
Also, I'd suggest turning yourself on as well as taking care of yourself. This is done not to hide or satisfy yourself until he turns around. It's to be done in order to keep this part of you alive and kicking and to keep you feeling happy and open. When he sees you happy and feeling good (without pressuring him), he's more likely to come towards you. Sounds backwards but he wants to know that when he comes to you that you aren't going to be jumping him. Take the pressure off of him but satisfying yourself.
I hope some of this resonates! S.