Relaxed and safe feeding thanks to NUK Temperature Control.  When  babies  are  hungry,  bottle  food  should  never  be  too  hot  or  too  cold.  For  this  reason, mums and dads check the drinking temperature before every meal. Knowing exactly when the right  temperature is  reached  can be  a  challenge. That's why NUK  First  Choice+ baby bottles with Temperature Control function were developed. This is a function that has not yet existed in this form before. To help from feeding the contents of the bottle too hot to your baby, NUK First Choice+baby bottlesnow feature the new NUK Temperature Control Indicator. It looks like a thermometer, is located within the graduation marks and the temperature of the contents of the bottle makes it change colour. In the future, the function will help parents to achieve the optimum temperature when feeding their baby. If the food is too hot, the normally blue indicator will turn white. Ideally, the food for feeding should have body temperature (37°C) and corresponds to the mean blue tone onthe display. The  new  Temperature  Control  function  is  integrated  in  NUK  First  Choice+bottles  made  of polyamide and polypropylene. Licensed editions are excluded. Important:  NUK  Temperature  Control  is  intended  as  an  additional  check.  Therefore,  the temperature should still be checked manually before actual feeding. To check the food,it is suitable to put a few drops on the inside of the wrist.