SwaddleDesigns Transitional Swaddle Sack with Arms Up Sleeves & Mitten Cuffs | 3-6 Months (14-21 lb) Watercolor Mountains

Meet the Transitional Swaddle Sack

The Transitional Swaddle Sack is designed to ease your baby from a traditional swaddle to a wearable blanket. With arms-up sleeves and half-length mitten cuffs, this wearable wrap invites self-soothing while offering partial suppression of startle-like movements to support peaceful wake-and-sleep cycles. The design also helps when babies roll, since arms can push up to access air and maintain an open airway for comfort and awareness.

What makes it a thoughtful transition?

This sack is ideal for babies who prefer sleeping with arms up, those beginning to roll, or little ones who tend to break out of a classic swaddle. The unique 1/2-length sleeves keep arms snug near the body for a secure feel without a full wrap, while foldover mitten cuffs can be opened or closed to suit your baby’s needs and mood.

• The TRANSITIONAL SWADDLE SACK enables baby to SELF-SOOTHE and may promote BETTER SLEEP and SAFER SLEEP; ideal for arms-up sleepers, early rollers, and swaddle-breakers.
• LITTLE SLEEVES with BIG PURPOSE: 1/2-length sleeves with foldover cuffs provide partial Startle reflex control and allow air access if needed during sleep.
• EASIEST way to move from a traditional swaddle to a wearable blanket. It’s snug, not overly tight, with hip-healthy positioning to support natural leg movement.
• FOLDOVER MITTENS Cuffs may be worn open or closed; caregivers can adjust for self-soothing, facial protection, or partial startle suppression.

Key Features at a Glance

• 100% Cotton with a soft, stretchy knit for comfort
• TOG 0.5 for breathable warmth
• 2-way, double-pull zipper for easy diaper changes and placement
• Size options by weight: S (6-14 lb), M (14-21 lb), L (21-24 lb)
• Designed by a nurse; US patent 11,812,795 with worldwide patents

Care is simple: machine wash warm and tumble dry low. This wearable blanket is made to fit babies in a natural flexed position while keeping limbs gently secured for comfort. The design supports transitions with a focus on safety features and practical wearability, making it a helpful option during the move from swaddling to a sleep sack.