Sleep Onesie 2.5 TOG Grey Marle
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.
| 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 |
| 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" |
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.
See full size guide for all products
- Free delivery on orders over $70*
- Estimated dispatch: 15 November 2026
- 30-day returns and exchanges
- Warmth
- Comfort
- Quality
- Fit
- Design
- Marcela S. G.Verified Buyer11/10/26ReviewingSleep Onesie 2.5 TOG DragonfliesRated 5 out of 5 starsReally nice!
I love this sleep suit, which is also a sleeping bag! A 2-in-1! Really lovely!
- Patricia M.Verified Buyer11/7/26ReviewingSleep Onesie 3.5 TOG DragonfliesRated 5 out of 5 starsSo warm and cozy
My sons room doesn’t have a heating source in it besides a wall space heater that warms the room up a bit too much when turned on. We live in Maine so winters get very cold at times, this onesie was an absolute must for us! It keeps him super warm and since he’s a toddler who can’t seem to keep a blanket on all night this was essential. It’s a great quality material and I love the design. It was well worth the cost to keep our baby warm!
- Lea E.Verified Buyer9/17/26ReviewingSleep Onesie 2.5 TOG Grey MarleRated 5 out of 5 starsFantastic crawl friendly sleep sack
This sleepsack is just fantastic and one of a kind. Baby is so warm at night and free to move without needing a blanket! Parents and baby sleep happily all night
