Baby Merlin’s Magic Sleepsuit Transition Swaddle in Blue Microfleece Helped my baby sleep through the night which is the greatest gift!! Size large (6-9 months) The Baby Merlin's Microfleece Magic Sleepsuit is the original swaddle transition product created by a Pediatric PT and mom of 4. The Microfleece Sleepsuit is ideal for babies with a strong startle reflex. Babies feel secure in the comfort of cozy microfleece fabric.