Sleep Onesie 3.5 TOG Dragonflies
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 weight and height to find the most appropriate and safe size for them.
Imperial Size Chart
| ergoPouch Size
(same as size) |
Pouch Length (inch) | Chest width (inch) | Child Height (inch) |
|---|---|---|---|
| 6-12M (0-1y) |
29.1" | 10.8" | 26.8 - 33.1" |
| 12-24M (1-2y) |
33.1" | 12" | 29.9 - 36.2" |
| 2-3Y | 34.6" | 12.6" | 36.2 - 39.4" |
| 4-5Y | 38.6" | 13.8" | 42.5 - 45.3" |
| 6-8Y | 43.3" | 15" | 47.2 - 51.2" |
| 8-10Y | 47.2" | 15.7" | 51.2 - 55.1" |
| 10-12Y | 51.2" | 16.5" | 55.1 - 59.1" |
Metric Size Chart
| ergoPouch Size
(same as size) |
Pouch Length (cm) | Chest width (cm) | Child Height (cm) |
|---|---|---|---|
| 6-12M (0-1y) |
74cm | 27.5cm | 68-84cm |
| 12-24M (1-2y) |
84cm | 30.5cm | 76-92cm |
| 2-3Y | 88cm | 32cm | 92-100cm |
| 4-5Y | 98cm | 35cm | 108-115cm |
| 6-8Y | 110cm | 38cm | 120-130cm |
| 8-10Y | 120cm | 40cm | 130-140cm |
| 10-12Y | 130cm | 42cm | 140-150cm |
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.
- Free delivery on orders over $70*
- Estimated dispatch: 06 April 2026
- 30-day returns and exchanges
- Aziza A.Verified Buyer4/3/26ReviewingSleep Onesie 2.5 TOG Petit PretzelRated 5 out of 5 starsTop quality
Quality is good
Keeps my baby warm
- Sirrah B.Verified Buyer3/24/26ReviewingSleep Onesie 2.5 TOG Grey MarleRated 5 out of 5 starsSuper warm
Really too warm to get much use out of it where I live!
- Anastasia K.Verified Buyer2/25/26ReviewingSleep Onesie 2.5 TOG DragonfliesRated 5 out of 5 starsSo cozy that our son doesn't want to take it off
Our son loves this cozy, roomy, flexible & soft sleep suit. It's out second purchase after he grew out of the smaller size. We make sure to keep the zipper head on the bottom so it doesn't create a small pressure point in the back when he sleeps. We love this suit and would highly recommend!
