NUK First Choice with NUK Temperature Control helps parents feed baby milk at the perfect temperature every time. The temperature of the contents of the bottle makes the indicator change colour: if the food is too hot, the normally blue indicator will turn white Orthodontic silicone teat is particularly soft for a natural drinking experience Clinically tested for an optimal combination of breast and bottle feeding 300ml: 0-6 months M (medium feed hole = for formula) Made of high-quality and lightweight polypropylene, BPA-free