SwaddleDesigns Transitional Swaddle Sack — Arms Up, Half-Length Sleeves, 0-3 Months, Heathered Gray

Overview

The Transitional Swaddle Sack from SwaddleDesigns is crafted to ease a baby from traditional swaddling while preserving a snug, secure feeling that many infants prefer. The arms-up design invites natural self-soothing as little one explores rolling and new sleep routines, all while staying comfortably wrapped in a soft, breathable layer.

Key benefits

• Arms-up design supports self-soothing and may contribute to easier bedtime routines.
• 1/2-length sleeves with foldover mitten cuffs provide partial suppression of Startle Reflex and keep arms near the body for snugness.
• Not a tight swaddle or a loose sack—designed for a secure yet comfortable transition with a snug tummy fit.
• Foldover mitten cuffs may be worn open or closed to balance access to hands with protection from facial scratches.
• Two-way, front-and-back zipper layout enables easy head placement and quick diaper changes.

Design and safety details

This 0.5 TOG, 100% cotton transition sack features a soft, stretchy fabric that feels gentle against delicate skin. The slightly shortened sleeve design helps keep little arms held in a natural, flexed position, while the sack length supports leg movement in a comfortable, secure way. The design includes a neck-size adjustment via the zipper and a patented construction that accommodates arm movement should a baby roll during sleep.

Fit, use cases, and sizing

The Transitional Swaddle Sack is ideal for babies who prefer sleeping with arms up, are beginning to roll, or tend to breaks out of traditional swaddles. Use the weight-based size guide to pick the right fit: S 6-14 lbs (0-3 months); M 14-21 lbs (3-6 months); L 21-24 lbs (6-9 months). Its snug tummy and shorter sack design help little ones feel secure while they explore movement.

Care and durability

• 100% cotton, TOG 0.5, soft and stretchy for day-to-day wear.
• Machine wash and tumble dry for easy care.
• Includes a helpful 2-way zipper that zips down for diaper changes and up from the top for easy outfit changes.

Notes

Designed by a nurse and protected by US patent 11,812,795 with patents in the EU, UK, China, Japan, and Korea. This transitional sleepwear is intended to support a safe, comfortable sleep transition with hands available for soothing and exploration.