SwaddleDesigns Transitional Swaddle Sack | Arms Up, Half-Length Sleeves, 3-6 Months (14–21 lb) | Gray

Transition with ease from swaddle to wearable blanket

The Transitional Swaddle Sack from SwaddleDesigns is designed to help caregivers move baby from a traditional swaddle into a cozy wearable blanket. With arms-up positioning, half-length sleeves, and foldover mitten cuffs, this design supports a calm, restful start to sleep while giving baby room to grow.

Key features blend comfort with practical function. The arms-up setup encourages baby to self-soothe in a familiar, compact silhouette, while the snug half-length sleeves provide partial suppression of the Startle Reflex when cuffs are closed. In moments when baby rolls onto the tummy, the arms can help lift the torso for easier access to air, contributing to safer sleep dynamics in the transition.

Why caregivers reach for this transition sack

• Ideal for babies who prefer arms up, who are starting to rollover, or who tend to break out of a traditional swaddle.
• Not a tight wrap or a loose sack—the design aims for a secure, comfortable fit that supports a natural hip position.
• Foldover mitten cuffs offer flexibility: keep them open for self-soothing by hand or close them to shield delicate skin and maintain snugness.

Design details and materials

• 100% cotton, soft and stretchy with a TOG 0.5, suitable for warmer nights.
• Two-way, double-pull zipper enables easy diaper changes from top and bottom without fully disturbing baby.
• Care instructions: machine wash warm, tumble dry low. Durable enough for daily wear and frequent washes.
• Designed by a nurse and protected by patents (US 11,812,795 and related international patents) to back practical, real-world use.

Fit and size guidance

Use weight-based sizing: S 6–14 lb (0–3 mo), M 14–21 lb (3–6 mo), L 21–24 lb (6–9 mo). For growing babies, size selection follows the weight range to keep sleeves comfortable without restricting movement.

Care and comfort

The gray fabric with striped trim adds a touch of style while keeping versatility. Machine washing and low-drying help maintain softness and fit night after night.