NUK Temperature Control helps parents feed baby at the right temperature every time. 61, The smart indicator on the bottle changes colour; if the food is too hot, the normally blue indicator will turn white. 62,The Orthodontic NUK shape is modelled on a mother's nipple as she breastfeeds for a natural feeling while drinking. It helps prevent colic with the Anti-Colic Air System which creates a natural flow so that your baby can drink in a relaxed way without swallowing air (which is thought to be a common cause of colic). BPA FREE. 63,Trio set includes 3 x 300ml First Choice Plus Bottles, suitable for 0-6 months, medium feed hole designed for formula. 64, Suitable for ages: 0-6 months.