SwaddleDesigns Transitional Swaddle Sack – Arms Up, Half-Length Sleeves, 6-9 Months (21-24 lb)

The Transitional Swaddle Sack is designed to ease the move from a traditional swaddle to a wearable blanket. With an arms-up design and half-length sleeves, it supports a snug, secure feel while helping your baby settle into a calm sleep routine. Crafted by SwaddleDesigns and built for babies who prefer arms up or are starting to roll, this sack blends soft comfort with practical features you can rely on night after night.

Why families choose this transitional sleep solution

• The arms-up design encourages self-soothing and can contribute to a more peaceful bedtime routine by keeping tiny hands in a familiar position.
• Half-length sleeves with foldover mitten cuffs provide partial suppression of the Startle Reflex and help keep arms close to the body for a secure feel.
• If your baby rolls over, the sleeves offer a natural way to lift the torso and head to access air, promoting safer sleep posture.
• Designed to be neither too tight nor too loose, the sack supports a comfortable, flexed position that respects hip development and natural movement.

Versatility for growing sleepers

• Foldover mitten cuffs can be worn open or closed; open cuffs allow hand-to-mouth self-soothing, while closed cuffs protect from facial scratches.
• Designed by a nurse, featuring 100% cotton fabric with a soft, stretchy knit that feels gentle on sensitive baby skin.
• TOG 0.5 offers lightweight warmth, making it a flexible layer for varying sleep environments and seasons.
• The two-way zipper runs from top to bottom, making it easier to place baby in the sack and to change diapers without fully undressing.
• Hip-healthy design supports a natural position and flexible movement as your baby grows and learns new skills.

Size guidance and care

Size is weight-based: S fits 6-14 lbs (0-3 months), M fits 14-21 lbs (3-6 months), and L fits 21-24 lbs (6-9 months). This 100% cotton fabric is machine washable and should be tumble dried on low for best results.

With US patent 11,812,795 and additional patents in the EU, UK, CA, CN, JP, and other countries, the Transitional Swaddle Sack reflects thoughtful design and ongoing innovation in wearable sleep solutions. Whether your baby is just starting to roll, tends to break out of traditional swaddles, or simply sleeps better with arms up, this wearable blanket offers a practical step between a tight swaddle and a full blanket.