The pioneering Philips Avent Anti-Colic Baby Bottles are carefully designed to make the feeding experience more pleasant for your baby. AirFree vents keeps the nipple full of milk, not air and a soft silicone nipple makes offers a steady flow.Pack 3 baby bottles. BPA-free. Soft silicone. 9 fl. oz. capacity. AirFree vent keeps the nipple full of milk, not air, as baby feeds in a range of positions for easier upright feeding. Features a valve that reduces vacuum buildup, and reducing air into your baby's tummy. Anti-colic bottle can be used with or without the AirFree vent, giving you the option based on your babys feeding needs. Stage 1 (Slow Flow). Dishwasher safe. Imported.