The BornFree™ Magic  |  Bisphenol-A Free  |  Eliminate Colic  |  Reduce Middle Ear Infection  |  Tested and Proven How does BornFree™ reduce the risk of middle ear infection? When vacuum builds up in conventional bottles, your baby is forced to suck harder and harder to create a flow of liquid. This has now been tested and proven. click here to find out more. Scientists have established that this sucking can cause a negative pressure to form in the middle ear. This can pull harmful liquid along the Eustachian Tube into the middle ear. Medical studies verify that this pressure is a contributing factor in causing middle ear infection. The unique vent on the BornFree™ feeding system prevents the need for sucking unnaturally hard and thereby reduces the risk of middle ear infection.