Description: Our 5 oz. crystal clear nurser bottle is made of the revolutionary Tritan™ material, and is BPA and toxin free. Developed under the direction of Dr. Andrew Weil, the bottle features the exclusive AirWave™ venting system that is clinically proven to reduce colic. It comes standard with a stage 1 nipple, ideal for newborns, and its one-piece vent is extremely easy to clean.