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 Nuk Air System releases air and allows the nipple to remain soft and keep its shape. The orthodontic design gently exercises tongue, palate and jaw and encourages the correct development of your child's teeth. May help reduce the risk of SIDS. Assembled in USA. Nipple made in Germany.