Why VentAire Advanced bottles are better for baby: A clinical study confirms that babies using new Playtex VentAire Advanced bottles had less gas spit-up colic and other discomforts than with other leading bottles. Heres why: Breakthrough Micro-Channel Vent Technology. Unlike ordinary bottles that vent through the nipple VentAire Advanced bottle keeps air at the back of the bottle as baby drinks so virtually NO AIR mixes with the milk and gets into babys tummy. Reduces the negative effects of vacuum build-up so baby controls the milk flow comfortably. Angled bottle design helps prevent ear infections. Promotes the semi-upright feeding position recommended by pediatricians to help prevent ear infections. Original Slender Shape bottle and nipple: Easy for baby to hold: 6 oz. (177 mL) and 9 oz. (266 mL) sizes. BPA free.Other products from HerbsPro