Spitting up at night

Je

At night after I burp my baby multiple times I lay him down and when I get up to feed him the next time there’s always spit up all over his bib and clothes and waterproof mat. It also sometimes misses the waterproof mat and lands on his crib. I thought he had reflux but he’s gaining a bunch of weight so his doctor keeps telling me he over feeds himself and I make a lot of milk. I’ve gotten advice on ways to help but ultimately there’s not much I can do but I was wondering if there’s anything I can do or use to keep him from spitting up so much and all over everything. He goes through 5 swaddles and clothes at night and I’m constantly washing waterproof pads and his crib sheet