No intimacy

Hello all, I'm posting this anonymously because it's an embarrassing subject for me. Since me and my SO got together I've had a higher sex drive than him. But recently since I got pregnant and had my baby our sex life has gone to complete shit. I mean, I can think back to when we first got together and I remember him not letting me go down on him. He would laugh and I used to think what is wrong with this guy?? Who doesn't like bjs? Fast forward a few years and now there's zero intimacy. Every time I try to initiate something, I get turned down with excuses. I have gained weight since I had my baby but not enough for him to be turned off by me and I'm trying to lose more weight. I really have no idea what to do. I'm sure he's not cheating on me, so that's not an option. Like I said, we've had this problem since we first met its just gotten worse since the baby came. I need advice. 😖😖