The Playtex VentAire bottle helps reduce gas and colic. Our patented bottle lets parents feed their baby virtually bubble-free. The leak-proof vent lets air in through the bottom of the bottle versus at the nipple like other bottles. So, there are virtually no bubbles for your baby to swallow. That means less gas, colic or spitting up. And, its angled shape promotes the semi-upright feeding position recommended by pediatricians to help prevent ear infections. The VentAire bottle is also easy to clean because top and bottom are removable and the vent is one piece. Wash by hand or in the dishwasher.