NUK First Choice+ Baby Bottle Temperature Control 150ml 0-6 Months is a bottle with a "Temperature Control" indicator to check that the contents of the bottle are not too hot. If it is too hot, the indicator on the scale will turn white. The optimum temperature for a bottle is body temperature (37°C = blue indicator).Clinically tested, its silicone teat is particularly soft. Its special shape is based on the shape of the mother's breast during breastfeeding. It provides enough space for baby's tongue and jaw for a natural feeding. Thanks to its "Soft Zone", the silicone nipple adapts even better to the palate for a natural drinking sensation. Its anti-colic air system ensures a natural flow of food and prevents baby from swallowing air.0% BPA.