Plastic Deco Bottles feature patented ActiveFlow venting technology that reduces air pressure and vacuum build-up, resulting in fewer colic symptoms caused by the ingestion of air during bottle-feeding of either breast milk or formula. The leak-free vent allows your baby to control the flow of milk, providing a feeding experience that"s closer to breastfeeding, and preventing teat confusion. Because Born Free provides an experience similar to breastfeeding, your baby can easily switch between breast and bottle-feeding, allowing you to breastfeed for longer.