Philips Avent Anti-Colic Bottle is clinically proven to reduce colic and discomfort with an anti-colic valve designed to keep air away from your baby's tummy. No. 1 brand recommended by mums worldwide (Based on December 2017 GemSeek online satisfaction survey conducted among more than 8,000 female users of childcare brands and products).Clinically proven (at 2 weeks of age, babies fed with a Philips Avent bottle showed less colic than babies fed with a conventional bottle and less fussing than babies fed with another competitor bottle).Easy to clean.0% BPA (following EU regulation 10/2011). Clinical studies show our Anti-colic bottle reduces colic and fussing, while preventing teat collapse (at 2 weeks of age, babies fed with a Philips Avent bottle showed less colic than babies fed with a conventional bottle and less fussing than babies fed with another competitor bottle). Few parts for easy cleaning and assembly. The teat shape allows secure latch and the ribbed texture helps prevent collapse for uninterrupted, comfortable feeding. Compatible with the Philips Avent Air-Free vent.