Natural milk flow - Baby controls the flow of milk similar to breastfeeding. Naturally fuss free - Active Flow Venting Technology clinically designed to reduce colic and gas. Naturally safe - Free from BPA and PVC. Active Flow Venting Technology - Patented Leak-free Vent System. The Born Free Bottle System is designed to address the feeding needs of all babies whether they are breastfed formula fed or both making it the natural choice for all mothers. Soft silicone nipple. Easy-grip cap ring. Active Flow Vent - Clinically designed to reduce colic and gas / Patented leak-free vent allows baby to control flow for an experience closer to breastfeeding. BPA Free - Safe and long lasting. Natural Feeding Thats Naturally Safe. BPA Free. The ideal bottle system for both breastfeeding and formula feeding. Lets baby control milk flow for an experience closer to breastfeeding. Clinically designed to reduce colic and gas. Hassle free - fewer parts to clean and maintain. Bottle cover included.