We found pace feeding helped.
How’s the weight? Is he in any distress? I’d speak to a doctor. They usually prescribe anti reflux medicine if they aren’t putting on enough weight/ losing weight or if unsettled and distress by it otherwise they say it’s just an unfortunate mess to clean up and with time it will get better Unless you’re ticking off all the allergy symptoms they would start down the reflux route first with medication and go from there
I'd talk to his dr. My baby has bad reflux and we've changed his formula, feeding amounts, and gotten him on medicine to help. He doesn't spit up nearly as much and seems more comfortable