
baby bottle manufacturers use the chemical bisphenol-a in their production. bornfree™ is made from a safe honey-colored plastic called pes (polymer) that is free of bisphenol-a. the new innovative air vent helps eliminate colic symptoms such as gas and spit-up by reducing the build up of vacuum and is also medically acknowledged to reduce the risk of middle ear infection. the unique inner valve prevents side-leaks, and unlike other vented bottles, allows you to shake freely when mixing.