AVENT NIPPEL CLASSIC 0M+, nippel for newborn 0+, flow nipple has a unique anti-colic valve that flexes to keep air in the bottle and out of your baby's tummy, a feature that reduces fussing and colic,The unique valve flexes to your baby's feeding rhythm so milk will flow at the pace chosen by your baby for more comfort. These soft, rounded Classic+ nipples are made of dishwasher-safe silicone, which is flavorless and odorless.,The newborn nipple has a single hole, so newborns can learn to eat with the slowest flow. Babies can control the milk flow like they do with breastfeeding, which can help reduce overeating and spit-up.