5 oz bottle feedings?

I have forceful let down and it causes my baby to have a lot of gas. She screams until she poops so to fix this I avoid laying her down after feedings but at night this isn’t possible bc I have to put her back in her pack n play. So I decided to bottle feed her w dr browns bottles since they are supposed to reduce gas. She ate 5 oz from the bottle Is that okay ? I know they say babies know when they are full but 5 oz just seems like a lot. She’s 9 days old. Am I over feeding my baby ??