Feed your baby with Avent Anti-Colic With AirFree Vent Feeding Bottle, SCF810/14, and keep your baby safe from any gastric issue, spit-up, or burping disorder. It is designed to reduce the cause of any kind of disturbance in feeding while your baby's asleep. Its anti-colic valve and AirFree vent prevents air from entering into baby's stomach, blocking it at the back. It allows only milk to pass through the teat. The nipple is especially made in accordance with baby's age and his flow rate requirements.