The AVENT Newborn Starter Anti-Colic Set includes four durable AVENT baby bottles (two small, two large) with accessories. The AVENT bottle is designed to help reduce colic. Perfect for newborns, the AVENT bottle set has a two piece anti-colic system that allows air to flow through the bottle, but not be swallowed by your little one. Unsettled behaviour is by far the most commonly known crying behaviour in babies. Colic can be the culprit, and is most common in the first few months of being born. Clinical studies show that the AVENT bottle significantly reduces colic, particularly at night. The Newborn Starter Set comes with a bottle brush for easy cleaning and a BPA-free soother to calm baby after feeding time.