MAM's Easy Start Anti-Colic Bottle is designed to reduce colic and gas. The innovative Anti-Colic system with a valve in the bottle base prevents the formation of air bubbles, which helps baby drink smoothly at their own pace and swallow less air.  It has a nipple shaped like mom which supports a seamless switch between breast and bottle.  This 5 oz. bottle comes with a silicone Size 1 Slow Flow nipple, making it the perfect bottle for newborns. With few parts and a self-sterilizing function, this bottle is easy to clean and sterilize.