Too young!

we have only been married for 2 years and he seems to have lost his ability to have lots of sex. we used to be able to do it 3 times a day but if I can get it together enough to have sex more than once a day (if that) then I would hope he could too. real talk, I take more care of our 6 month old than he does but he acts worn out despite your both having full time jobs. how do i re-engage him to get more lovin'? I already get naked and wear sexy things!