The nuk first choice teat features the special orthodontic nuk shape and an extra wide lip support that simulates breast feeding as closely as possible the nuk teat also features the nuk anti colic air system which allows air to flow into the bottle through a vent stopping baby swallowing air and helping to prevent colic pack includes 2 x size 2 latex teats 6 18 months medium feed hole approved by the british dental health foundation bpa free features the nuk anti colic air system wh