Baby Merlin's Yellow Magic Sleepsuit in Night Sky is the original swaddle transition product for infants aged 6-9 months, created by a pediatric physical therapist and mom of four. It features a soft jersey cotton inner layer, a breathable cotton outer layer, and a polyfill middle layer for optimal comfort. This sleepsuit helps establish healthy sleep habits, ensuring babies get the rest needed for proper growth and development, and offers parents peace of mind. Designed for back sleeping in the crib at the recommended room temperature, it includes a double zipper for easy diaper changes and is machine washable. Proper fit and timing are crucial for the safe and effective use of the Magic Sleepsuit, so referring to the sizing chart is recommended.