This is the only bottle my son would when I transitioned him to bottle feeding. I guess it was because I had given him MAM pacifiers, and he got used to the shape of the nipple on the pacifier (which is the same as the bottles) I really like how you can sterilize the bottles on it's own. I didn't need to purchase a separate sterilizer to use for these bottles. I still use these, and would definitely recommend this brand to new mommies :)