Frustrated!!!

Natalie
My husband and I just had a baby. He's 4 moths old. I had a lot of complications with him and was on bed rest the second half of my pregnancy and I gained a lot of weight. I used to be 126 and now I'm 156. I went from a size 2 to a size 10. 
Trying to loose the baby weight and sex is still great. But he wanted to start trying for another baby now. At first I said yes. And we were having sex one to two times a day! It was awesome!!! But I talk to him about maybe waiting longer if I'm not sonic an get the weight off first. He said he's okay with it, but we just stopped having sex. We did once but it just wasnt that great. I feel like he's upset with me for saying I want to wait. When I was okay with it he wanted to jump in the sack any chance we got. Aka morning sex and before bed. Now he has a lack of interest. When I ask him about it he says that we do and there isn't a problem... But i definitely feel like there is... Opinions please!