Feeding struggles

Denise

Hi! My LO is 4 weeks and on formula. I am struggling to figure out how much and how often to feed him. I’ve been giving him 4oz every 3/4 hours roughly. He still seems starving most of the time though. He also seems super backed up, like he’s trying to poop all day but just can’t and will usually wind up having one giant BM at night. He also spits up all day long. I am trying a gentler formula, I am using a probiotic, and burping often during feeding. Is this all normal?! I know this is a lot of info but this group was such a great support while I was pregnant so I figured I would reach out and see if anyone is going through something similar.

(Also I am in communication with pediatrician so just looking to share stories/ advice). Thank you!!!