Yes, you do. The bottle neck size of the Classic polypropylene bottle may slightly change over time. The adapter ring makes sure the anti-colic valve in the teat will work properly, preventing air into your baby's tummy.
Article Published Date : 2017-08-09
Yes, you do. The bottle neck size of the Classic polypropylene bottle may slightly change over time. The adapter ring makes sure the anti-colic valve in the teat will work properly, preventing air into your baby's tummy.