My baby has only used Philips Avent bottles since she was born (she’s 8 months). The nipples on these are different than what she has had in the past. Apparently, they changed all the nipples to have this swirl thing and my baby hates them and refuses the bottle. I can’t find the “old” nipples anywhere. If the nipples had been like the old ones (the description doesn’t indicate that the nipples are different than they used to be), then I would have given 5 stars. Now, I have 2 bottles I cannot use because I can’t find the old style nipples.