NUK First Choice+ baby bottles have an orthodontic shaped teat and super soft zone which simulates the shape of a mother's nipple during breastfeeding. This makes it easier for baby to accept and for mum to alternate between breast and bottle-feeding. The built-in Temperature Control indicator changes colour from blue to white when the bottle's contents are too hot, so you can be sure your baby's milk is always at a comfortable drinking temperature. The natural shape of the NUK teat also perfectly adapts to baby's sensitive palate and helps exercise their jaw and teeth, while the NUK Anti-Colic Air System minimises infant colic caused by the harmful swallowing of air. Each bottle is BPA-free and durable, while the included sealing disc ensures leak-proof transportation.