NUK Anti-Colic Professional - The answer to your colic concerns A good feeling in the tummy, at last. Swallowing air when feeding is a major cause of typical colic symptoms such as wind, tummy cramps and constant crying. The NUK Anti-Colic Professional was developed to help prevent babies swallowing air when feeding. Its secret is the NUK Professional Ventilation System, which helps prevent air being swallowed even more effectively. It is an innovative combination of an air valve and an air channel. The air valve ensures that the teat does not contract when feeding, meaning that your baby can feed without having to let go. This eliminates one of the main causes of air being swallowed. The integrated air channel directs the air from the valve directly to the bottom of the bottle - without air bubbles coming into contact with the contents of the bottle. This prevents the milk from accumulating air. And less air in the food means less air in baby ́s tummy. So, this is the way the bottle helps to prevent colic. Confirmed by experts and parents. Features: The normally blue indicator turns white 96% of experts confirm the reduction of air in the feed Includes a suitable cleaning brush for the adapter tube Teat clinically tested: for an optimal combination of breast and bottle feeding Built-in temperature control indicator changes colour when the food is too hot.