The NUK First Choice Plus 150ml Bottle comes with a particularly soft silicone teat, in size 0-6 Months (medium hole for formula). The bottle uses the NUK Anti-Colic* Air system that minimises the harmful swallowing of air which is thought to be a common cause of colic. With the new soft zone, the silicone baglet is as soft as a mother's breast, fitting better against the roof of your baby's mouth and giving a natural drinking feeling. NUK Temperature Control helps parents feed baby's at the right temperature every time. The smart indicator on the bottle changes colour; if the food is too hot, the normally blue indicator will turn white (when over the optimum 37 degrees). The NUK First Choice Bottle is BPA free.