My husband has no sex drive

Carley • Mama to a 1 year old son, wife to a loving husband! Professional shower singer. Nashville bound next year!
We have a 1 year old and have been married for almost 2 years. His excuse is he's too tired. He gets hard as soon as I touch him but when we do have sex it's usually pretty quick. We've had several talks about it with still no change. Any tips?