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.