Sleep sack sizes and how long each size fits
How long a sleep sack keeps fitting a baby before a larger size is needed, based on the listed sizes, size limits and fit checks.
ergoPouch Cocoon Swaddle Sack: The Cocoon Swaddle Sack 0.2 TOG in the Berries print is listed in four sizes: 0000, 0-3M, 3-6M and 6-12M, each with its own SKU. Size 0-3M (000) is 60 cm long, for babies 3-6 kg and about 62 cm tall. Size 3-6M (00) is 70 cm long, for babies 6-8 kg and 62-68 cm tall; ergoPouch notes this size was previously called 2-6 months. ergoPouch says the correct fit is when two fingers can be placed inside the neck opening. ergoPouch Cocoon Swaddle Sack (also sold as ErgoCocoon Swaddle Bag): The Daydream 0.2 TOG swaddle is listed in three sizes: 0-3M, 3-6M and 6-12M, each with its own SKU. For size 0-3M (also called 000) the pouch is 60 cm long, for babies of 3-6 kg and 62 cm height. ergoPouch Cocoon Swaddle Sack / Cocoon Swaddle Bag (0.2 TOG): The structured product data lists four sizes for this product: 0000, 0-3M, 3-6M and 6-12M. ergoPouch Cocoon Swaddle Sack (the UK maker page calls it Cocoon Swaddle Bag): The Starbeam 0.2 TOG Cocoon is sold in three sizes: 0-3M, 3-6M and 6-12M.
| Product | Why | Sizes offered | Size limits | Fit check | Fit warning |
|---|---|---|---|---|---|
| 1. ergoPouch Cocoon Swaddle Sack sold by ergopouch.com | Size 0-3M (000) is 60 cm long, for babies 3-6 kg and about 62 cm tall. | The Cocoon Swaddle Sack 0.2 TOG in the Berries print is listed in four sizes: 0000, 0-3M, 3-6M and 6-12M, each with its own SKU. listing | Size 0-3M (000) is 60 cm long, for babies 3-6 kg and about 62 cm tall. manual | ergoPouch says the correct fit is when two fingers can be placed inside the neck opening. manual | Reports that the bag creeps up over the baby's face during the night, even in what parents believed was the correct size, appear several times, and two parents describe it as a suffocation risk. review |
| 2. ergoPouch Cocoon Swaddle Sack (also sold as ErgoCocoon Swaddle Bag) sold by ergopouch.com | For size 0-3M (also called 000) the pouch is 60 cm long, for babies of 3-6 kg and 62 cm height. | The Daydream 0.2 TOG swaddle is listed in three sizes: 0-3M, 3-6M and 6-12M, each with its own SKU. listing | For size 0-3M (also called 000) the pouch is 60 cm long, for babies of 3-6 kg and 62 cm height. manual | - | Several parents who say they used the correct size report the swaddle creeping up over the baby's face with the arms in; one says they only noticed because they checked in the night and calls it a suffocation risk. review |
| 3. ergoPouch Cocoon Swaddle Sack / Cocoon Swaddle Bag (0.2 TOG) sold by ergopouch.com | The structured product data lists four sizes for this product: 0000, 0-3M, 3-6M and 6-12M. | The structured product data lists four sizes for this product: 0000, 0-3M, 3-6M and 6-12M. guide | - | - | The 0.2 tog fabric was reported as too stretchy to hold fists in: the baby wriggled hands out through the top, the zip came undone and the fabric rode up over the face, while the same parent was happy with the 1.0 tog version. review |
| 4. ergoPouch Cocoon Swaddle Sack (the UK maker page calls it Cocoon Swaddle Bag) sold by ergopouch.com | The Starbeam 0.2 TOG Cocoon is sold in three sizes: 0-3M, 3-6M and 6-12M. | The Starbeam 0.2 TOG Cocoon is sold in three sizes: 0-3M, 3-6M and 6-12M. listing | - | - | Several users report the swaddle creeping up over the baby's face when the arms are in, and describe this as a suffocation risk even in what they believe is the correct size. review |
Also cited in the text
- ergoPouch Cocoon Swaddle Sack, dimensions and limits: Size 3-6M (00) is 70 cm long, for babies 6-8 kg and 62-68 cm tall; ergoPouch notes this size was previously called 2-6 months. manual
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Written 2026-10-15T13:33:49.498Z.
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