ergoPouch Cocoon Swaddle Sack 3.5 TOG – Baby Sleep Sack for 0–3 Months (Willow)

All-in-One Sleep Solution for Newborns

Meet the ergoPouch Cocoon Swaddle Sack 3.5 TOG, a versatile sleep sack that grows with your baby. From snug arms-in swaddling for newborns to a breathable arms-out sleep sack as your little one gains mobility, this design supports each stage of your baby’s sleep journey. When you’re ready for hands-up swaddling, pair with our Butterfly Cardi (sold separately) for a secure, flexible fit that can adapt to your baby’s changing rhythm.

Designed to feel comfortable and calm, the cocoon-style shape and gentle stretch help your baby settle into sleep with a snug, womb-like embrace. The soft fabric moves with tiny limbs, so little wiggles don’t wake a sleepy moment. While every baby is unique, many parents appreciate the way this sack supports transitions between sleep positions and helps keep sleep time predictable and cozy.

Choose the Right TOG for the Nursery

Safety and comfort are easier to manage with four warmth options. TOG 0.2 is ideal for warmer rooms, TOG 1.0 suits mid-range temperatures, TOG 2.5 works for cooler nurseries, and TOG 3.5 is designed for cooler nights. Each option helps your baby stay comfortable without the need for loose blankets, supporting a calmer sleep environment throughout the year.

The system is designed to adapt to your nursery, helping you avoid over-bundling or under-warming. This flexibility makes it simpler to respond to seasonal changes and daily temperature shifts, so you can focus more on bedtime routines and quiet moments together.

Premium Materials for Sensitive Skin

Crafted from 95% GOTS-certified organic cotton and 5% elastane, the sleep sack is soft, breathable, and gentle on sensitive skin. The fabric is dyed with non-toxic, water-based dyes, chosen to stay safe and vibrant after repeated washes. The product is approved by the Eczema Association of Australasia as a skin-friendly option for babies with eczema or irritations, providing added peace of mind for families with skin sensitivities.

Practical Design Details

• Newborn Swaddle Sack & Baby Sleep Sack in One: Converts from arms-in swaddle to arms-out sleep sack with shoulder snaps. Use with the Butterfly Cardi for hands-up swaddling if you prefer.
• Easy Zipper Access for Diaper Changes: A two-way zipper with a protective cover keeps delicate skin safe during night-time changes.
• Promotes Healthy Hip & Leg Development: Bell-shaped bottom allows room for movement while the snug fit helps settle babies for longer, more restful sleep.
• Durable, Non-Toxic & Easy to Wash: Machine washable and designed to last through multiple babies; dyes stay vibrant wash after wash.

In short, the Cocoon Swaddle Sack is built to endure daily life with a newborn—quiet nights, soft textures, and straightforward care, all while supporting your baby’s evolving sleep needs without fuss.