NUK® Space™ pacifiers have a revolutionary shield that has extra large openings. This enables maximum airflow and allows baby’s gentle skin to breathe and prevent irritation. The NUK® Space™ pacifier’s unique breast-like nipple is shaped to soothe baby just like mom. This makes for an easy transition from breast to pacifier and back. Invented over 60 years ago by pediatric dentists and doctors, NUK®’s unique orthodontic nipple shape helps promote healthy oral development. The NUK® heart-shaped shield fits perfectly under baby’s nose for easier breathing and prevents irritation. NUK® Space™ designs feature a Glow-in-the-Dark button which allows parents and babies to easily find the pacifier at night if it falls out of the child’s mouth. To activate the Glow in the Dark feature, expose the pacifier to light for two minutes until the button glows green.