Delivering a quick, variable flow that is perfect for use with thicker liquids, our Y-Cut nipples are best for babies who are older than six months and are proficiently consuming thicker formulas and rice cereal type food. Perfectly designed to help the transition from breast to bottle, this award-winning silicone nipple exclusively fits Comotomo baby bottles; meant to reduce the likelihood of bottle refusal. Naturally-shaped, soft, silicone nipples that are ideal for breastfed babies. Designed to eliminate nipple confusion issues. Made of 100% safe, hygienic, medical-grade silicone. Dual anti-colic vents prevent unwanted air intake and reduce colic.