This sleep sack swaddle is used by many hospitals and trusted by millions of parents for safer sounder sleep. Adjustable wings allow swaddling arms in hands to face or arms out adapting to your baby growth and preferred sleep style. Made with soft microfleece and rated for warmth this swaddle provides safe snug warmth in cooler nursery temperatures without extra layers. The two way zipper opens from the bottom for quick nighttime diaper changes without removing the swaddle. Recognized as hip healthy by the International Hip Dysplasia Institute this sleep sack swaddle features a roomy sleeveless design that allows natural movement and supports healthy development.