X-cut nipple for variable flow. Fits narrow neck bottles. Caring for your little one from tip to toe. Inspired by a mother's nurturing heart - gentle, reliable, safe & protective, Tippy Toes by Top Care was designed to care for every inch of your baby, from the very tips of their toes and up! Tippy Toes by Top Care Vari-Flow Nipples are designed with your baby's comfort & safety in mind. Made from medical grade silicone, these nipples are BPA free to safely feed your baby. Suitable for standard neck feeding bottles. These Vari-Flow Nipples adjust to all stages of feeding allowing baby to control the flow of milk or formula.