Created by a physician, Dr Browns Natural Flow baby bottles feature a patented internal vent system that helps reduce colic, spit-up, burping and gas The positive pressure design allows babies to feed comfortably, because the vent system eliminates the air bubbles and vacuum All parts are dishwasher safe This 2-pack of replacement Caps are exclusively for all standard Dr Browns Natural Flow baby bottles These are the same pieces that come with all standard Dr Browns Natural Flow baby bottles and are meant to replace worn or lost Caps
