Food-Grade: Made of 100% food-grade silicone, free of BPA, PVC, phthalates. New-Design: Points on the nipple guiding for appropriate latch, train babies with correct suction habits in breastfeeding. Breast-Like: Nipple enables babies to engage in the same natural sucking actions learned at the breast, allowing for a smooth transition from breast to bottle and back again. Anti-Colic: Shaped to help minimize swallowed air. Advanced venting system to prevent gas. Natural-Flow: From SS to LL size. M Nipple Recommended Age: 3 months+. Soft & Snug-Fitting Nipple: Breast-like shape for a natural latch and easy transition between breastfeeding and bottle feeding. Include What: 2 pack of Medium Flow M nipple; Recommended Age: 3 months+; Numvim Silicone Bottle Nipple with Latch-On Point, Gentle Flow, Natural Feel - 2 pack of Medium Flow M nipple; Recommended Age: 3 months+;