The Dr. Brown's Natural Flow baby bottle is the only baby bottle that features a patented internal vent system. This vent eliminates the air bubbles and vacuum effect to allow positive-pressure feeding with no air – similar to breast-feeding. 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. Features: * Easy to clean and top-rack dishwasher safe * Connects directly to most breast pumps. Newborn Feeding Set Includes: * Three 8 oz. standard bottles * Two 4 oz. standard bottles * Five Level-One nipples * Two Level-Two nipples * Patented two-piece internal vents, travel disks, caps, cleaning brushes, and instructions. Awards: American Baby Best of the Year (AMBY) award for 2004. Gold Winner in the 2000 Medical Designs Excellence Awards (MDEA).