Sleep Essentials
Arms-Up Transition Sleep Sack
Anti-Startle Baby Swaddle Wrap · 1.0 TOG
1.0 TOG + Full-Length Zip + Arms-Up Design
The startle (Moro) reflex is a normal newborn survival instinct — but it's also the reason so many babies jolt themselves awake mid-nap. Instead of pinning your baby's arms down, our arms-up design lets baby stay near their face, self-soothing while still easing that reflex. It's the natural next step after a traditional swaddle, and a safer, easier alternative to loose blankets in the crib.
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- Ships worldwide
- Soft combed cotton
- Secure checkout
See It In Action
Arms-Up Transition Sleep Sack
$34.90
$44.90
How It Works
Arms-up wings ease the startle reflex
Two soft fabric wings hold baby's arms in a gentle raised position near the face, rather than pinning them down — calming the Moro reflex without full restriction.
Full-length zip for fast changes
A bottom-to-top zipper means nappy changes don't require fully undressing baby, keeping late-night wake-ups short.
Breathable, all-season fabric
Soft combed cotton rated at 1.0 TOG, manufacturer-stated as comfortable across a 15–25°C room temperature range.
The Design Details
Every detail is built around one goal: calmer sleep, safely.
ARMS-UP WING PANELS
Soft fabric wings, sewn into each shoulder seam
Hold baby's arms in a raised, open position so hands stay near the face for self-soothing, easing the startle reflex without fully restricting movement.
FULL-LENGTH FRONT ZIP
Bottom-to-top zipper, chin guard at collar
Opens fully for fast nappy changes without waking baby, with a fabric guard at the top so the zipper doesn't catch skin or chin.
1.0 TOG COMBED COTTON
Manufacturer-stated rating, not independently lab-verified
A mid-weight warmth rating intended for room temperatures of roughly 15–25°C — use the touch test (neck/chest warm, not sweaty) and layer clothing underneath accordingly.
Full Materials & Composition
Combed cotton, described by the manufacturer as meeting a Chinese-market Class A infant-textile grade. This is a manufacturer-stated sourcing claim, not an independently verified Western certification.
How to Use
- 1 Fit baby's arms into the raised wing panels, hands resting near the face.
- 2 Zip from the bottom up, checking the fit isn't tight around the neck or shoulders.
- 3 Check your room temperature against the TOG guide and dress baby in lighter layers underneath if the room runs warm.
- 4 Transition to an arms-free sleep sack once baby shows signs of rolling, per your pediatrician's guidance.
Pairs well with our swaddle wrap for the earliest weeks, before transitioning fully into the arms-up sack.
Machine washable combed cotton, built for everyday wear and wash.
Complete the Newborn Set
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Understanding the Newborn Startle Reflex
Why babies startle themselves awake, and how an arms-up design can help them sleep (and stay asleep) longer.
Always follow current pediatric safe-sleep guidance and stop any arms-up product once baby shows signs of rolling.