Replace your baby’s bottle nipple as they grow and develop with First Essentials by NUK™ Replacement Nipples. The soft silicone nipples are gentle on gums and designed with a vent hole that helps reduce colic by limiting the amount of air baby swallows. It’s important to replace your baby’s bottle nipple every two months for safety and hygiene or as they grow and can feed at a faster pace. It’s recommended that babies use medium flow nipples between the ages of 4 and 6 months. Replacement nipples also available in slow (0m+) and fast (6m+) flow. First Essentials by NUK™ is a complete line of infant and toddler products from NUK® providing simple solutions for mom and baby.