Sex drive going down

Before my husband and I got pregnant I had a really really high sex drive. I mean literally I wanted him every day at least twice a day and when I got pregnant it was even higher. I desired him so much that I had to tell myself to calm down or he was going to get tired with me (which was a lie, he has a really high sex drive as well). But after giving birth, for the first 8 weeks after giving birth I still desired him a lot and now it's like I can't even convince myself to get hot for him which I find kind of bad because like I said he has a really high sex drive. I'm talking I can go weeks without doing anything and not feeling anything and I feel like because of that I feel stressed and have low self esteem. If anybody has tips please help because I don't understand how I went from a really really high sex drive to none at all.