The nipple has a no-drip design which helps prevent lost milk from the tip.
Unlike traditional bottles the Natural bottle is designed to only release milk when your baby is actively drinking, like what happens when babies breastfeed. An anti-colic valve integrated into the nipple is designed to reduce colic and discomfort by sending air away from your baby's tummy. Use Philips Avent Natural bottles only with Philips Avent Natural nipples. They have 5 different nipple flow rates for the Natural bottle.