NUK Space Pacifiers have a revolutionary shield that has extra-large openings, enabling maximum airflow and allowing babys gentle skin to breathe.” The heart-shaped shield fits perfectly under babys nose for easier breathing and prevents irritation. Like all NUK pacifiers, NUK Space is accepted by 95% of babies* and feature a unique, improved asymmetrical nipple that naturally fits babys palate to allow more room for a natural sucking motion, reduces pressure on teeth and jaws, and helps prevent teeth misalignment. Invented over 60 years ago by pediatric dentists and doctors, NUK orthodontic pacifiers are modeled after the natural shape of moms nipple while breastfeeding, creating an easy transition from breast to pacifier and back. All pacifiers are BPA free and dishwasher safe (top rack only). (*Based on Market Research, 2017, tested with 307 pacifier users.