The Philips Avent Anti-Colic 4-oz Baby Bottle promotes health and comfort for your baby. This BPA-free bottle is proven to reduce colic and fussiness, especially at night. The unique valve integrated into the nipple flexes to allow air into the bottle, preventing vacuum buildup and preventing air from getting into baby's tummy. The valve on the anti-colic baby bottle nipple also flexes to your baby's feeding rhythm so milk only flows at your baby's pace to minimize overeating and spit-up, burping and gas. The extra soft silicone nipple is available in different flow rates for babies of all ages. With few parts, rounded edges and a wide neck, the bottle is easy to clean thoroughly.