Colic in infants may be caused by a combination of in?uences including ingesting air during feeding. The new advanced comfort™ range from Closer to Nature is specially designed to help reduce air bubbles in the milk and to encourage a good latch-on to help reduce the risk of baby ingesting air during feeding. The air vents down through the tube and into the air-space at the base of the bottle, completely bypassing the milk. Unique tube and value system to provide optimum vending during feeding Unique, easy-latch-on teat shape that promotes continuous feeding Soft, natural-feel silicone teat to make it easier to switch between breast and bottle Easy-hold bottle with slow-flow teat Bottle compatible only with Closer to Nature advanced comfort™ teats (not Closer to Nature Easi-Vent teats) BPA-free