SwaddleDesigns Transitional Swaddle Sack – Arms Up Half-Length Sleeves, 0-3M, Heathered Jadeite

The SwaddleDesigns Transitional Swaddle Sack is designed to ease your baby’s shift from a traditional swaddle while prioritizing comfort and secure sleep cues. Ideal for newborns who love to sleep with arms up, babies who are starting to roll, or little ones who tend to break out of classic swaddles, this wearable blanket offers a flexible fit that adapts to your baby’s evolving needs. The arms-up, half-length sleeves with foldover mitten cuffs can be opened or closed, giving you control over snugness while supporting self-soothing and a natural sleeping position.

Key benefits you may notice in real life include a companionable, snug feeling that can help calm baby at bedtime, plus the ability to adjust the cuffs to protect tiny hands or encourage self-soothing by hand. When your baby rolls, the design allows arms to reposition, helping them lift their torso and head to access air as needed. The two-way zipper makes dressing and diaper changes quicker and less disruptive, especially during late-night routines.

What makes the design work for families

• Arms-up 1/2-length sleeves with foldover mitten cuffs provide gentle suppression of the Startle Reflex, helping baby settle into sleep cues.
• If your baby rolls over, the partial sleeve design helps arms reposition naturally, supporting safe positioning and ongoing comfort.
• Foldover cuffs can be worn open or closed, so you can encourage self-soothing by hand or protect tiny fingers from facial scratches.
• The 2-way double-pull zipper zips from top to bottom, simplifying both easy placement and quick diaper changes.

Fabric, fit, and care

• Made from 100% soft cotton knit with a gentle stretch for comfort and ease of movement.
• TOG 0.5 provides light warmth suitable for moderate room temperatures and layered sleep setups.
• Small size fits babies 6–14 lb (0–3 months); built for ongoing wear as your baby grows.
• Machine wash warm and tumble dry low for easy care.

Design validation and safety notes

• Designed by a nurse with the baby’s best interests in mind, balancing snugness and mobility.
• Recognized by IHDI as hip-healthy, reflecting thoughtful alignment with growing baby needs.
• US Patent 11,812,795 and D833,613, with additional patents in EU, UK, CA, CN, JP, and more.

How to use

• Dress baby into the sack with arms up beneath the fabric.
• Choose open or closed mitten cuffs based on self-soothing goals or facial protection needs.
• Zip from top to bottom to place baby in the sack, then zip from bottom for diaper changes.

Available in Small for 0–3 months and 6–14 lb, the SwaddleDesigns Transitional Swaddle Sack combines comfort, flexibility, and thoughtful design to support a calm bedtime routine. While outcomes vary, many families appreciate the option to tailor the experience to their baby’s preferences.