Formula help !!

Brittany • Daxton 12-17-15 & Eli 9-29-21 🤍
So I started my 3 week old son in infant enfamil, and he's spitting it up a lot, super fussy, and his belly seems upset! 😢 I wanna switch him over to the gentle one for sensitive belly! Any reviews on it or anyone have this happen with their lo!?