ergoPouch Long Sleeve Sleeping Bag 3.5 TOG

The ergoPouch Sleep Suit Bag in 3.5 TOG is a warm, arms-out sleeping bag for babies and toddlers who have moved on from being swaddled. With a slim-fit, stretchy shape similar to a swaddle, it's designed as baby's 'first sleeping bag' after the swaddling phase — a wearable sleep sack that keeps your little one covered through the night without loose blankets. The 3.5 TOG rating is the warmest in the range, suited to cooler rooms sitting between roughly 12 and 19°C.

What makes this one versatile is that it doesn't stay a single garment. Using its 4-way zipper configuration, it cleverly converts from a traditional sleeping bag into a sleep suit with legs. That makes it a practical option for sleeping on the go in a 5-point harness — such as a pram — and for active toddlers who prefer a bit of leg freedom while they settle.

Thoughtful, skin-friendly design

The Sleep Suit Bag is made from GOTS-certified organic cotton in a premium 400-thread-count woven fabric, so it sits soft and gentle against baby's skin. The natural fibres are breathable, and the slim, stretchy fit moves with your baby rather than bunching. A bell-shaped bottom gives the hips and legs room to bend and move freely, and the two-way zip makes nappy changes and dressing simpler without fully undressing your child.

How to use it

Choose your size by baby's weight and height rather than age alone, and use the 3.5 TOG weight in cooler rooms (around 12–19°C), layering underneath according to the room temperature. To help you get the layering right, sizes in the 3–24 month range come with a free room thermometer and a What to Wear guide, so you can check the nursery temperature at a glance and dress baby accordingly. It's machine washable for easy everyday care.

Best for

The ergoPouch Sleep Suit Bag (3.5 TOG) is a great option for parents who:

• Have finished the swaddling stage and want an arms-out sleep sack as a next step
• Need a warmer TOG weight for cooler rooms
• Want one garment that converts to a legged suit for pram naps or an active toddler
• Prefer organic cotton against baby's skin and an easy two-way zip for changes

It may not be the best fit if you:

• Are still swaddling a younger baby who needs arms contained
• Only need a lightweight option for warm summer nights

Good to know

As with any sleep sack, always follow the garment instructions and check the neck and arm openings still fit correctly so your baby's head can't slip inside. Baby should be placed on their back to sleep on a firm, flat surface in a clear sleep space, with no loose bedding needed. Sizing is guided by weight and height: the 3–12 month size suits roughly 6–10 kg and 62–76 cm, and the 8–24 month size roughly 8–14 kg and 68–92 cm.