Playtex VentAire Wide Bottles Gift Set helps reduce gas and colic. The leak-proof vent lets air in through the bottom of the bottle unlike other bottles that let air in at the nipple. It means that there are virtually no bubbles for baby to swallow. So there's less gas, colic or spitting up. Also, its angled shape promotes the semi-upright feeding position that paediatricians recommend to help prevent ear infections.