The Philips Avent Anti-Colic Baby Bottle with AirFree Vent, 9oz, promotes the health and comfort of your baby. This BPA-free bottle is designed to reduce common feeding issues including colic, gas, and reflux. The unique AirFree vent keeps the nipple full of milk, not air, as baby feeds in a range of positions for easier upright feeding, helping baby ingest less air. The AirFree vent is a single piece and easy to clean without special tools. The bottle also features a valve that reduces vacuum buildup and can be used with or without the AirFree vent, based on your baby's feeding needs. The extra-soft silicone nipple is available in different flow rates for babies of all ages, and works interchangeably with most of the Philips Avent range.