No. 1 selling pacifier brand. Unique Nuk shape helps optimize oral development. Breastfeeding. BPA free. 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. Assembled in USA. Nipple made in Germany.