The Sleep Onesie is a TOG-rated sleep sack alternative, designed to be worn on its own during sleep or with a Romper/PJs underneath for warmth and comfort.
Size Guide
Sleep Onesie
Please use your child's height to find the most appropriate and safe size for them. The Sleep Onesie should be fitted around the neck to avoid your child slipping through. 2.5 TOG and 3.5 TOG Sleep Onesies should not be used in a 5-point harness or car seat for safety reasons.
| ergoPouch size | 6-12M | 12-24M | 2-3Y | 4-5Y | 6-8Y | 8-10Y | 10-12Y |
|---|---|---|---|---|---|---|---|
| Same as size | 0-1y | 1-2y | 2-3y | 4-5y | 6-8y | 8-10y | 10-12y |
| Pouch length (cm/inch) | 74cm / 29.1" | 84cm / 33.1" | 88cm / 34.6" | 98cm / 38.6" | 110cm / 43.3" | 120cm / 47.2" | 130cm / 51.2" |
| Chest width (cm/inch) | 27.5cm / 10.8" | 30.5cm / 12" | 32cm / 12.6" | 35cm / 13.8" | 38cm / 15" | 40cm / 15.7" | 42cm / 16.5" |
| Child height (cm/inch) | 68-84cm / 26.8 - 33.1" | 76-92cm / 29.9 - 36.2" | 92-100cm / 36.2 - 39.4" | 108-115cm / 42.5 - 45.3" | 120-130cm / 47.2 - 51.2" | 130-140cm / 51.2 - 55.1" | 140-150cm / 55.1 - 59.1" |
- Free delivery on orders over $70*
- Estimated dispatch: 27 May 2025
- 30 day returns and exchanges for full priced products
- Carmen L.Verified Buyer5/24/25ReviewingSleep Onesie 2.5 TOG PicnicRated 5 out of 5 starsSo soft and warm
I love the TOG rating and the peace of mind baby will be warm at night. He loves that he can move around and it's great that we can size up but I'm still confident he will be safe and not trip. Washes well.
- Josephine W.Verified Buyer5/19/25ReviewingSleep Onesie 2.5 TOG DragonfliesRated 5 out of 5 starsVery happy with service & product
High quality little onesie. My grandson is in-between sizes so I bought a size too big, but there is always next winter. Lovely soft fabric, quality zips. Would recommend buying a few as when washing takes time to dry. Love that the packaging comes with alot of info and the temp gauge. A little $$ if you need to buy a few but the quality,.info, service and delivery is high. :)
- Paula A.Verified Buyer5/19/25ReviewingSleep Onesie 2.5 TOG PicnicRated 5 out of 5 starsCozy baby
Best way to keep out baby warm and cozy during cold nights