Make sure you are using the slowest flow nipple for the bottle, or the slowest flow that baby can effectively drink from. It should take baby at least 15 minutes to finish a bottle. My baby was drinking no more than 2 oz until at least 4 weeks. Then he was drinking 2.5oz until 6-8 weeks. He was drinking 3-3.5 oz for the longest time and still only drinks that much at 8 months. We recently just upped his bottles to all 4 oz and he refuses to finish most of them. I have to offer smaller bottles often. It’s better to feed in smaller quantities more often than larger quantities less often.
@Emily That’s really helpful, thank you!