Dr. Brown's 4 Oz. Standard BottleCreated by a physician, Dr. Brown’s Natural Flow baby bottles feature a patented internal vent system that helps to reduce colic, spit-up, burping and gas. The positive pressure design allows babies to feed comfortably, Designed to: * Reduce colic, spit-up, burping, and gas * Prevent air bubbles from forming in milk or formula * Help reduce fluid in the ear * Prevent nipple collapse |