Getting Horny

Ever since having my son, my libido has been so off. I went from wanting to have sex every night to now it's rare that I'm ever in the mood. The past few weeks I've been purposefully getting sexual with my boyfriend just so he's satisfied, and it does feel good for me. But now a days I just can't get horny or wet or anything. What makes you horny, or how would you go about getting your libido back?