<https://www.kidslandusa.com/dr-brown-polypropylene-newborn-feeding-kit/#Product>
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"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:\r\n\r\nReduce colic, spit-up, burping, and gas\r\nPrevent air bubbles from forming in milk or formula\r\nHelp reduce fluid in the ear\r\nPrevent nipple collapse\r\n\r\nFeeding Kit Includes:\r\n\r\nThree 8-oz Standard bottles, two 4-oz bottles, plus two extra Level-Two nipples and two Storage/Travel caps\r\nPatented two-piece internal vents, travel disks, caps, cleaning brush, and instructions"
<https://www.kidslandusa.com/dr-brown-polypropylene-newborn-feeding-kit/>