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 color 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 minimizes 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.