* Natural nipple helps combine breast and bottle feeding* Comfort petals make nipple softer and more flexible* Nipple shape promotes natural suckling motions* Twin anti colic valves make feeding more comfortable* Durable silicone is odorless and easy to sterilizeCompatible with Avent Natural bottles only The 6 Avent Nipple Sizes Details Ideal Age Feeding GuideFirst Flow ❤ 0 month Suitable for preemies !#!amp!*! newbornsNewborn Flow ❤ 0+ months Suitable for newborns !#!amp!*! breastfed babies of all agesSlow Flow ❤ 1+ months Suitable for newborns !#!amp!*! breastfed babies of all agesMedium Flow ❤ 3+ months Suitable for babies three months of age and olderFast Flow ❤ 6+ months Faster flow that is suitable for babies who are six months of age and olderGrow Up Flow ❤ 9+ months Fastest flow that is suitable for babies who are Nine months of age and olderVariable Flow ❤ 3+ months The slot is adjustable to allow thicker liquids and suitable for babies who are 3 months or olderThick Feed Teat ❤ 6+ months Ideal for foods of thicker consistency, such as cereals or soups