Natural shape. No. 1 selling pacifier brand. BPA free. NUK air system. NUK natural shape nipple promotes healthy oral development. The Original Orthodontic shape. 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 you child's teeth. www.NUK-USA.com. Assembled in USA. Nipple made in Germany.