Sex life after having a baby?

me and my SO are talking about trying to have a baby in the future. One of his major concerns are the lack of sex life afterwards. Does this really happen? just curious. He just personally worries because I already don't have an as high of sex drive as him. (no idea why I just don't and do not know how to change it) Anyone have a higher sex drive after a baby? once again just curious. thank you!