This bottle features the original nuk orthodontic shaped teat with extra wide lip support which simulates breast feeding as closely as possible and the nuk anti colic air system which minimises infant colic caused by harmful swallowing of air nuk first choice bottles are compatible with all first choice teats r r r r 240ml bottle fitted with a size 1 0 6 months latex medium feed hole teat and a sealing disc for leak proof transportation r r approved by the oral health foundation