Benefits \ \ from the nipple to the base, the "options+" option makes the transition from breast to bottle easier. \ \ starting from the top, each nipple is specially designed to offer the same consistent natural flow, so you and baby know what to expect at every feed. the new breast-like nipple shape is precisely contoured for proper "sucking" and a more natural experience - perfect for the transition from breast to bottle and back again! together with the internal anti-colic ventilation system, baby feeds without fuss. \ \ but it doesn't stop there. \ \ the internal anti-colic ventilation system features an improved design to improve an already groundbreaking feeding experience: \ \ clinically proven to reduce colic \ reduces "slurping", burping and gas \ proven to better retain nutrients in milk. \ aids digestion for a good night's sleep \ offers a flow rate that supports breastfeeding. \ option+™ is dishwasher safe (top rack) and sterilizer safe. \