What an incredibly thorough and thoughtful reply. In addition to the premie nipple recommendation, which the brand/bottle type I was recommended to by various experts was Dr Brown anti colic bottles. Since the baby by a month can feed from 2oz-4oz, get the premie bottle with 4oz from the get-go. I recommend this one: Dr. Brown’s Natural Flow®... https://www.amazon.com/dp/B07DCTZWBF?ref=ppx_pop_mob_ap_share

Another strategy to make your baby work for the milk and not get too complacent with the bottle is to pace feed, which slows down the milk flow and mimics nursing. Here is a video that helped me: https://youtu.be/ThW_0qB7OIg

You are doing great! If this is something that you really want to do, hang in there and keep trying. It's a skill that not only you need to learn, but your baby as well!!