Help plz....comments welcome

Me and my fiance been together from 2 years. On and off for 7 , talking on and off.

Anyways... the past couple months like i dont even wanna have sex with him. Like I dont get excited about it anymore... everytime hes kissing all over me and stuff im just literally laying there saying in my head "omg, this is so boring like wtf am i doing " idk whats going on. Sometimes I feel like there's no more chemistry, ever since we had our baby (she just turned 1) everything has changed .. idk i feel like i dont have the same feeling for him anymore and idk what to do.. i hope this is just a phase....