SwaddleDesigns Transitional Swaddle Sack with Arms Up Half-Length Sleeves and Mitten Cuffs, Heathered Gray, 0-3mo, 6-14 lbs (Parents' Picks Award Winner), Small

THE IDEAL TRANSITIONAL SWADDLE. LITTLE SLEEVES with BIG PURPOSE. When parents close the mitten cuffs on the 1/2-length sleeves, the uniquely-shaped sleeves will provide partial suppression of the Moro (Startle) Reflex, and if baby rolls over on to tummy, baby can use their arms to lift upper body and reposition head to get access to air, which makes the TRANSITIONAL SWADDLE SACK a SAFER SLEEP OPTION.
THE TRANSITIONAL SWADDLE SACK IS DESIGNED TO BRIDGE THE GAP FROM SWADDLING TO WEARABLE BLANKET. When baby is ready to transition from a swaddle, but not ready for a sleeveless wearable blanket, the Swaddle Sack is a great option to (1) keep baby snug and warm, (2) allow baby the use of his or her arms, and (3) allow baby to self-soothe by sucking on his or her hands.
FOLDOVER MITTEN CUFFS MAY BE WORN OPEN OR CLOSED, parents can open the cuffs, so baby can SELF-SOOTHE, or close the cuffs to PROTECT BABY FROM FACIAL SCRATCHES. UNIQUELY SHAPED ARMS UP HALF-LENGTH SLEEVES with mitten cuffs will keep baby's arms close to body, but within reach of mouth.
THE TRANSITIONAL SWADDLE SACK IS PERFECT FOR BABIES WHO PREFER TO SLEEP WITH ARMS UP. Swaddle Sack supports baby in a back sleeping position, allowing for multiple arm and hand positions to help baby sleep better.
INNOVATIVE 2-way zipper. Premium Cotton Knit. Small 6-14 lbs, 0-3 months; Medium 14-21 lbs, 3-6 months. US Patent D833,613.