My 4 month old is ALWAYS hungry?

I have no idea what to do, I feel like she’s eating too much. She will drink 6oz, burp great be satisfied for an hour & screams for more. I never ever would deny her food & im aware all babies have different appetites BUT she spits up so much so frequently even with great burps. I she’s formula fed & I pace feed her. Takes her about 20-25 mins to finish 6 oz & we stop halfway to burp. 6oz every hour or 2 just seems so frequent. I don’t want to add rice. And I’m waiting until 5.5 months to start purées. But, any suggestions for this?