The Sleep Onesie is a TOG-rated sleeping bag alternative, designed to be worn on its own during sleep or with a Layer/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 $100*
- Estimated dispatch: 07 December 2025
- Extended returns until 31 January 2026
- chiara c.Verified BuyerReviewingSleep Onesie 2.5 TOG Oatmeal MarleI recommend this productRated 5 out of 5 stars16 hours agoGreat
Love these pijamas
- chiara c.Verified BuyerReviewingSleep Onesie 3.5 TOG DragonfliesI recommend this productRated 5 out of 5 stars16 hours agoAmazing
Super comfy and high quality
- Hannah S.Verified BuyerReviewingSleep Onesie 2.5 TOG Oatmeal MarleI recommend this productRated 5 out of 5 starsYesterdaySuper soft, cosy warm suit
Lovely sleep suit that keeps my baby comfy and cosy all night through.
Easy changing with the zips, although I don’t use the rear ones, just the front one. The turn over cuffs are super useful to keep feet warm at night but allow stable walking for a toddler when feet are out.
The size of the suit means it’ll last a while, our last one in a smaller size lasted almost 1 year until my little one grew out of it.