How can I get him to want me more??

Yalele • I am a 37 year old mother of 4 wonderfully awesome children...Ailsa 16, Miguel 14, Jeshua 9, and baby Royaleice almost 2
I have been with my fiancé for three years..we just had a beautiful baby girl..but he rarely ever wants to have sex. He says it's not me but I can't help but thinks so..he's been this way since the beginning.. Am I too sexual or is this normal?? I want it almost every day. He can go a month without it. I've tried everything..