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: 16 May 2025
- 30 day returns and exchanges for full priced products
- Ayushi M.Verified Buyer4/22/25ReviewingSleep Onesie 3.5 TOG DaisiesRated 4 out of 5 starsGood for sensitive ones
My 10 month old is so sensitive to changing temperatures that she immediately develops a runny nose! I ordered a 12-24 month size for her because Ergopouch does 'slim fits' which don't fit my child in her normal size range. Right now this sleep onesie is long for her legs but overall I think it keeps her warm because of the 3.5 tog and since her nose has not acted up.
- Emma H.Verified Buyer3/31/25ReviewingSleep Onesie 3.5 TOG DragonfliesRated 5 out of 5 stars“So snuggly” says Mr 2.5
I bought this sleep onsie because our 2.5year old sleeps in a double bed but refuses to sleep under the covers. Not such a big deal over summer but now it’s getting colder in NZ he was waking up around 3-4am because he was cold. Since we bought the sleep onsie, he’s back to sleeping through the night. “It’s so snuggly”, he says. He loves it so much that it’s really hard to get him to take it off in the mornings!
- Rebecca S.Verified Buyer3/19/25ReviewingSleep Onesie 2.5 TOG Fruit SaladRated 5 out of 5 starsPerfection!
My littleone LOVES her sleep onsie! She HATED sleep sacks….. she would wake up yelling “STUCK! STUCK!” because she loves a or in her sleep. This was the PERFECT solution!
The stretchy arms are genius…. we’ve tried others and it was a fight to get the arms through…. the convertible feet are fantastic and the print is adorable . I will be purchasing a backup soon!
Thanks for keeping my little warm and cozy at night!