TRANSITIONAL SWADDLE SACK promotes BETTER SLEEP and SAFER SLEEP. Perfect for babies starting to or able to ROLL OVER, babies who like to sleep with ARMS UP and suck on hands to SELF-SOOTHE, and babies who can escape or get out of a classic swaddle LITTLE SLEEVES with BIG PURPOSE. ARMS UP 1/2-LENGTH Sleeves with mitten cuffs closed provide arm mobility and partial suppression of Moro Reflex, so BABY SLEEPS BETTER, and if baby rolls over, allow baby to use arms and reposition, so BABY SLEEPS SAFER MOST GRADUAL TRANSITION with NO COLD TURKEY. With mitts closed, TSS may be used to partially suppress Moro reflex for multiple weeks when baby is able to roll and still has Moro reflex. After the reflex fades, parents may gradually open one mitt at a time Recognized by IHDI as hip friendly. Elbow-length sleeves support baby’s arms in flexed position and allow arm mobility. Not a tight swaddle nor a loose sleeveless wearable blanket. Lower section supports baby in a flexed position to help baby feel secure DESIGNED BY A NURSE with Baby's Best Interest in Mind. FOLDOVER MITTEN CUFFS may be worn OPEN OR CLOSED. Caregiver can open one or both mitts, so baby can SELF-SOOTHE, or close the mitts to AVOID THE RISK OF FACIAL SCRATCHES 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