This Birdie Bean glow-in-the-dark convertible romper is perfect for your baby! It can be worn as a romper or converted into a footie, giving you two great options in one piece. It's made of 95% bamboo viscose and 5% spandex, which is soft and gentle on your baby's sensitive skin. The 2-way zipper makes diaper changes easy. The sizes range from 12-18M to 3T, with added length for longer wear. You can activate the glow-in-the-dark feature by placing it in sunlight for 2-4 hours or under a UV light for 30-60 minutes. Machine wash cold with mild detergent, inside-out, fully zipped, with like colors and other bamboo items. Tumble dry low, lay flat, or hang to dry. Do not bleach.