What is a Safe Mattress?

A safe mattress is one that is the right size for the cot, is firm, clean and in good condition.

Some important points to remember when using a mattress:

  • Make sure the mattress is the size and depth recommended by the manufacturer of the cot. 
  • There should be no more than a 20mm gap between the mattress and the cot sides. 
  • Tip – no more than 2 finger width between the edge of the mattress and the sides of the cot. 
  • Use a firm mattress. A soft mattress can increase the risk of a fatal sleeping accident if the baby sleeps on their tummy.  
  • Remove all packaging from the mattress.
  • If using a detachable waterproof protector, make sure it is strong and has a tight fit.  
  • With portable cots, use the firm, clean and well-fitting mattress that is supplied with the cot
  • Do not add another mattress or any padding in the cot.
  • The mattress must be flat, not tilted or elevated in any way. 
  • A pillow, cushion or sofa is not a safe mattress as they are too soft. 

Use a mattress that meets the voluntary standard for testing firmness (AS/NZS 8811.1:2013) 

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Last updated on April 22, 2025
Published on April 14, 2025

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