Spit up

Eli

My baby is 5w old, he seems to spit up large amounts after feeding. It doesn't look funny, or have an odd color. He has also been gaining weight, but does have a lot of gas. How much did your babies spit up at a time? And should I be worried at all?

He has an appointment with his doctor soon, but has been acting just fine so I haven't been concerned enough to move it up