The Born Free Bottle System is uniquely designed to address the feeding needs of all babies--whether they are breastfed, formula fed, or both--making it the natural feeding choice for all mothers. The patented ActiveFlow Venting Technology helps extend breastfeeding by mimicking mother's natural flow which is controlled by baby while nursing. This active feeding helps prevent nipple confusion and reduces air ingested by baby while feeding. The ActiveFlow Technology is also clinically designed to reduce colic symptoms such as gas pain and fussiness which can be experienced particularly after drinking formula.