Baby Merlin Baby Sleepsuit Wearable Blanket is a swaddle accessory to transition babies from the swaddle with a cozy, secure feeling. Crafted of breathable jersey cotton, the sleepsuit provides baby with a warming sleep environment anywhere.Baby Merlin's sleepsuit wearable blanket helps transition babies from the swaddle by providing them with a cozy, secure feeling. Babies should be transitioned out of the sleepsuit when they roll over or try to roll over in it. For back sleeping in the bare crib only in a room at the recommended temperature for babies. Designed to aid in baby's sleep patterns. For babies 3 to 9 months old, sizes vary. Zipper closure for easy changes. 100% breathable jersey cotton inner layer. 100% cozy micro-fleece outer layer. Layer of poly-fill in between. Machine wash cold, tumble dry low. Imported.