Advanced Anti-Colic bottle is specially designed to help reduce air ingestion and to encourage a good latch-on during feeding. Features: – Unique tube and value system to provide optimum vending during feeding. – Patented air vent sucks air though the wand to reduce air in your baby’s milk. – 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 medium-flow teat – Bottle compatible only with Closer to Nature advanced comfort teats (not Closer to Nature teats) – BPA-free