Newborn feeding?

My baby is a month old today!

He was eating 4 oz every 3 hours but recently and I mean today he’s been wanting more. So I gave him 6 oz every 3 hours. Sometimes he won’t finish the entire bottle but other times he does. Am I over feeding him??

There’s a decent amount of spit up, and he actually farts a lot like some of them he pushes out and seems like they hurt him

I also just switched him from the yellow can enfamil neuropro to the purple can neuropro today as well. We see his pediatrician on Friday so I will ask her too just trying to get a feel for things here