Promotes Better Sleep: Helps ease your baby from swaddle to magic merlin sleep sack 6-12 months; allows freedom of movement while promoting longer, restful sleep for both baby and parents Ideal Fit for 6-12 Month Babies: Specially designed for back sleeping; baby merlin sleep sack 6-12 months helps babies transition from swaddling; offers comfortable fit for restful sleep Design for Enhanced Comfort: Baby sleep sack features wearable blanket made of two layers of breathable fabric for added coziness and comfort with two-way zipper for easy diaper changes