Natural shape. Promotes healthy oral development. BPA free. No. 1 selling pacifier brand. NUK air system. NUK natural shape nipple promotes healthy oral development. NUK pacifiers are based on the shape of a mother's nipple while breastfeeding and are therefore optimally adapted to the baby's oral cavity. The orthodontic design gently exercises the tongue, palate and jaw and encourages the correct development of your child's teeth. Assembled in USA. Nipple made in Germany.