Nuk FC+ Temp Bottle with Silicone Teat, Kuala, 300 ml Orthodontic nipple made of silicone Bottle made of polypropylene 300 ml Temperature control Anti-colic valve BPA-free Comfortable and safe bottle feeding thanks to NUK temperature control. When it comes time to bottle feed your baby, it is important that his food is neither too hot nor too cold. But it is not so easy to determine the temperature of food in a bottle. This is exactly why the NUK "First Choice Plus" baby bottles with the NUK temperature control scale were developed. It is located inside the measuring scale and changes its color depending on the temperature of the contents of the bottle from blue (cool) to white (hot). The ideal temperature for baby food is 37?C, which corresponds to the blue color of the temperature indicator scale. Comfortable and safe bottle feeding thanks to NUK temperature control. When it comes time to bottle feed your baby, it is important that his food is neither too hot nor too cold. But it is not so easy to determine the temperature of food in a bottle.