We tried A LOT of different bottles, and these are by far the best! My 10 week old loves the flow, she doesn’t burp a lot after, no extra gas or fussiness, the numbers are easy to read on the side, it doesn’t leak, they’re super cute, they fit well in diaper bag for travel, and they’re easy to clean. I just can’t say enough good things about them. We tried Dr. Browns, Phillips Avent Anti-Colic, Phillips Avent Natural (seriously how do they keep getting away with selling the "new” nipple design),See full review