spitting up

Ashley
My 3 week old spits up constantly. We're on our 4th onesie change for the day. Doesn't matter if it's bottle or breast.
The ped said some babies just spit up more than others but this seems ridiculous! Anyone else having this issue? We keep her upright as much as possible. I gently burp her. We pace feed. Idk what else to do. I feel like we can never leave the house because she always spits up down herself 😔