The TRANSITIONAL SWADDLE SACK allows baby to SELF-SOOTHE and promotes BETTER SLEEP and SAFER SLEEP; Perfect for babies who prefer to sleep with ARMS UP, babies who are starting to rollover, and babies able to break out of a traditional swaddle LITTLE SLEEVES with BIG PURPOSE. Arms Up Swaddle with 1/2-length sleeves and mitten cuffs closed provide partial suppression of Startle Reflex to help baby SLEEP BETTER; if baby rolls onto tummy, baby can push up to access air for SAFER SLEEP EASIEST way to move from a traditional swaddle to a wearable blanket. Transitional Swaddle Sack is not a tight swaddle nor a loose sack. Snug fitting and Hip Healthy design supports baby in natural position and flexed position to help baby feel secure FOLDOVER MITTEN CUFFS MAY BE WORN OPEN OR CLOSED; Caregiver can open one or both cuffs, so baby can SELF-SOOTHE, or close the cuffs to PROTECT BABY FROM FACIAL SCRATCHES and provide partial suppression of startle reflex. 100% Cotton. TOG 0.5 Soft stretchy fabric. 2-way double-pull zipper for EASY DIAPER CHANGES. Use baby's weight to select size: S 6-14 lbs 0-3 mo; M 14-21 lbs 3-6 mo; L 21-24 lbs 6-9 mo. Machine wash. Tumble dry. US Patent 11,812,795 WW patents online