A great choice to get you started, our two-pack of 9 oz. crystal clear nurser bottles are made from the revolutionary Tritan material that is BPA and toxin free. Developed under the direction of Dr. Andrew Weil, the bottles 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.