NWT Baby Merlin’s Magic Sleep Suit Sleepsuit Blue Size 6-9 month (Large) 18-21 lbs. 100% Cotton Inner Layer 100% Polyester Outer Layer The Magic Sleepsuit is our patented swaddle transition product created by a pediatric physical therapist and mother of four. It is designed to help your little one when breaking out of the swaddle but still seeking the safe and comfortable feeling that the swaddle provides. The Magic Sleepsuit provides that cozy feeling while allowing your baby the freedom of movement they need as they develop.