A mothers nipple adapts perfectly to a babys mouth that is why the new improved nuk first choice43 teats replicate a mothers nipple whilst breastfeeding the feeling is not only pleasant for babies the soft nipple easily takes on different shapes whilst also promoting the development of the mouth lips and tongue r r r r 2 x size 2 silicone teats 6 18 months r r anti colic air system which allows air to flow into the bottle through the improved vent stopping baby swallowing air an