Size Large 6-9 months Excellent condition Baby Merlin's Magic Sleepsuit is the original swaddle transition sleepsuit that provides babies with a cozy, calming, and safe sleep environment. The patented Magic Sleepsuit is designed for babies who are ready to transition from the swaddle but still need that cozy and contained feeling to aid in their sleep. The Magic Sleepsuit is designed to be used for back sleeping only in the crib.