Formula feeds

Best thing to do if you guys aren’t on the same page is to go see your doctors and get advice.
If his throwing up I wouldn’t top us his bottle, i would start slow feeding him (different feeding technique) as he could be drinking it to fast making him sick, slow feeding also gives time for babies belly and brain to catch up to each other

I always went by if they are finishing their bottle then add an oz to the next bottle

Our almost 4 week old has been taking 5 ounces (150ml) on a somewhat regular basis for the last few days. Sometimes he’ll drink 1-2 ounces (30-60ml) and fall asleep after a burp and then want more or the rest of the bottle after about 30 minutes. Sometimes he’ll drink the whole 5 ounces (150ml) bottle and want an ounce or two (30-60ml) more after a short nap. He was on the larger side when he was born at 8lbs 6oz (3.8kg) and 22 inches (56cm). Gaining weight well - at his 2 week appointment he weighed 9lbs 3oz (4.2kg) and probably about 10lbs (4.5kg) now. If he’s getting sick/spitting it back up, it might help to burp him every ounce or two (30-60ml) or wait 15 minutes or so to see if he wants more after his little tummy has some time to start digesting. He used to poop 4-5 times a day for the first couple of weeks but has been 1-2 times a day since his bowel movements have become more regular

I always went with it they consistently finish the bottle for 3-4 feedings in a row then I add an oz going forward. I always wanted a half oz to an oz of waste when they're full after a feed. My boys always ate a lot, I'm talking like 5 oz every 3-4 hours and then slug feed 8oz before going to bed at night. My youngest was up to almost 50oz a day at 4 months with food 😂😅. Ask your Dr, you can always try again or pace feed and see how he goes. Constipation may have just been a coincidence