Boon Nursh Bottle feature a revolutionary air-free feeding design with a 100 percent silicone pouch that collapses as your little one drinks, helping prevent colic symptoms like gas and spit up. Other baby bottles use vents or valves that introduce air into milk to help it flow, Nursh doesn’t. Pouch collapses as baby drinks, mimicking breast feeding with no added air. As a bonus, no vents or valves make it a snap to clean and assemble. Nursh’s optimal nipple shape and length are easy for baby to latch on to and the patented design ensures milk never touches plastic, only platinum food-safe silicone.