Soft Silicone Spout to handle nobbly surface for a non-slip grip. Babies become toddlers, and bottles slowly replace the breast. To help make the changeover to drinking without your help easier, there is the NUK First Choice System. The NUK First Choice Spout in silicone is spill-proof and pleasantly soft. The NUK Air System equalizes the pressure in the bottle which helps reduce colic as less air is swallowed. Silicone is neutral in taste and smell, as well as very heat resistant. Silicone is particularly hygienic and easy to clean. The spout is easy to remove from and put back into the screw ring. It fits all NUK Air System Bottles and is suitable for children from 6 months old.