So much pee!!!!

So my nearly 4mo eats 5oz, about 6x daily. He will sleep through the night between 6-8hrs total. Here lately when I get him up in the morning, he is soaked in pee!! i have 3 crib sheets that I'm constantly washing and changing out every, single day! Any tips on how to manage this better? I use Luvs diapers and I love them, they work just fine any other time. I was using Huggies, which suck! Lol