German dentist Dr. Mueller and M.D. Balters co-founded NUK in 1956 and today is the world-renowned maternal and baby products brand owned by MAPA. NUK's products are recommended by parenting experts around the world for their scientific design and high quality, and more than 90% of hospitals in Germany use NUK hospital-specific products in neonatal departments. NUK bottles have a printed body, which is more durable than regular bottles, but it may also affect the hygiene of the bottle when washing.