Chicco NaturalFeeling Nipple contains a dual anti-colic valve that prevents air intake, reducing the risk of colic. It has a specific broad base for the lip support of the first months, which favors the natural suction. The embossed rings at the base simulate the maternal breast and increase the elasticity and flexibility of the teat. Adjustable flow adapts to baby's needs 1. Slow flow - 2. Medium flow - 3. Fast flow. It allows babies to keep their necks in the right position, reducing the risk of ear infections.