Dr. Browns Natural Flow Level 2 Nipple is the next step for babies 3 months+. Dr. Browns Level 2 Nipple, together with the Anti-Colic internal vent system, is clinically proven to reduce colic. Dr. Browns bottle and nipple provide a more comfortable feeding experience for baby by decreasing spit-up, burping and gas. This vacuum-free feeding is closest to breastfeeding and Dr. Browns Medium Flow Nipples provide a consistent flow so baby can feed at their own pace. The breast-like nipple shape encourages a proper latch for a more natural bottle feeding experience and eases the transition from breast to bottle and back again. The Level 2 Nipple and Anti-Colic vent system is proven to help preserve bottle milk nutrients and aid in digestion for a better nights sleep. Made of super-soft, 100% silicone, the Level 2 Nipple fits all Dr. Browns narrow bottles. The suggested age range for the Level 2 Nipple is 3 months+, but babys preferred flow rate may vary. Safe for use in dishwasher (top rack only), electric and microwave sterilizers or boiling water. BPA free NIPPLE FOR GROWING BABY. Dr. Browns Medium Flow Nipple is the next step for growing babies. ANTI-COLIC BABY BOTTLE WITH NIPPLE. Level 2 Nipple, with Anti-Colic internal vent system, is clinically proven to reduce colic. Decreases spit-up, burping and gas and provides a more comfortable feeding experience for baby. CONSISTENT FLOW RATE. Vacuum-free feeding is closest to breastfeeding and Dr. Browns Medium Flow Nipples provide a consistent flow so babies can feed at their own pace. DEPENDABLE NIPPLE FLOW. Each nipple level provides clinical consistency within the flow rate, so babys feeding experience is constant and comfortable. BREASTFEEDING SILICONE NIPPLE. The breast-like nipple shape encourages a proper latch for a more natural bottle feeding experience and eases the transition from breast to bottle and back again. PRESERVES NUTRIENTS. The Level 2 Nipple and Anti-Colic vent system is proven to help preserve bottle milk nutrients and aid in digestion for a better nights sleep. SOFT 100% SILICONE. Silicone nipple fits all Dr. Browns narrow bottles. DISHWASHER SAFE. Safe for use in dishwasher (top rack only), electric and microwave sterilizers or boiling water. BPA Free.