M.T.
Hi N.,
Congrats on the brand new baby! Three ounces may be more than a tiny newborn needs at one time. My first baby was bottlefed, and I found that when I used the orthodontic nipples, it took her FOREVER to eat, like 45 minutes for a bottle. Once I used other nipples, she ate better. My suggestion would be, if you are only using one type of nipple, switch to something else, either a different "flow" or a different material. My daughter did better with a harder nipple, maybe she had some low muscle tone in the mouth and found it harder to latch onto a softer nipple. But if the baby isn't actively, hungrily, sucking, and she isn't fussing to eat more, she may simply be full
Good luck!