Relationship advice, PPD? Idk

Ladies I need advice - Relationship advice.

I’ve been with my boyfriend for 2 years, we have a baby together. We’ve known each other for 10 years. He’s great, he does everything for his child and I. Always thinks of me, buys me dinner, and just cute things to let me know he’s always thinking about me. However, lately...I’m feeling off? I don’t want to have sex at all and I think we have had sex once since the baby was born. I have absolutely no sexual desire and I can tell he’s getting worried I’m no longer attracted to him...I can’t even tell if I am, I know I love him...but why don’t I wanna have sex with him? I’m so confused why my body literally rejects him when he tries to touch me or kiss me. I’m lost in my feelings and not sure what this means? Any advice?