Product description NUK Anti Colic Professional Bottle Adapter Set Swallowing air while feeding is the main cause of typical colic symptoms, such as gas buildup, tummy pain, and constant crying. The NUK Professional Air Vent Systemeffectively prevents air from being swallowed. The bottle features an innovative combination of an air vent and an air channel. This prevents the teat from becoming constricted, allowing your baby to feed without interruption. This eliminates one of the main causes of air swallowing. The integrated air channel directs air directly from the vent to the bottom of the bottle – air bubbles do not come into contact with the bottle contents. Less air gets into the food. Less air in the food means less air in the tummy. This is how the Anti-Colic Professional Adapter Set helps prevent colic. NUK Anti-Colic Professional Bottle Adapter Set - fits NUK Anti-Colic Professional bottles and all 300 ml NUK First Choice bottles; - the washing brush is also suitable for washing NUK Action Cups and NUK Flexi Cups The set includes: 1x tube 1x adapter 1x washing brush