
I used Avent anti-colic bottles until my baby had to move up from 4oz bottles. The avent always frustrated me because if the insert wasn't in perfectly then the bottle would leak. Same problem with Dr. Brown bottles. I really wanted something anti-colic though and a friend recommended these. I love them. No annoying insert so they never leak. The anti-colic at the bottom of the bottom is so easy to clean as well. PLUS the bottles are self sterilizing. Awesome buy.

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