the soft feel and natural shape of this natural touch nipple gently flexes and elongates like mom's breast. This allows your baby to position the teat at the correct angle for feeding and mimic the natural action of breastfeeding. This greatly helps ease the transition from breatsfeeding to bottle feeding. the softflex nipple features 3 superior valves in the base o the nipple to help prevent colic, as well as soft nubs on the surface that massage your baby's gums.