Complete Tummy Comfort Unique Anti-Colic Bottom Vent Fewer air bubbles means a happier tummy for baby! The tiny micro-channel bottom vents keep air at the back of the bottle. As baby feeds, virtually no air mixes with the milk and gets into baby’s tummy. Angled Design Helps Prevent Ear Infections The angled bottle design promotes the semi-upright feeding position, recommended by pediatricians to help prevent ear infections. Easy Switching Between Breast and Bottle Feeding The Most Like Mom NaturaLatch Nipple mimics the breast to help baby latch on naturally and promotes easy switching between breast and bottle feeding.