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Last updated: 02 August 2018

Any sleep surface that's too soft could increase the risk of Sudden Unexpected Death in Infancy (SUDI). But how firm should a cot mattress be? We test a range of mattresses to see if they pass the Australian standard method. We also check if dimensions are accurate. For more, see how we test, and read our tips for buying a safe cot mattress (including how to check the firmness yourself).

We don't just test cot mattresses, we also test prams/strollers and cots among many other products. See here for a list of the Top 50 tests we conduct at CHOICE.

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Until recently, there was no way of telling whether a cot mattress was firm enough to be safe for your baby. Even now, mattresses can be legally sold without officially meeting any product safety requirements. However, responsible manufacturers test their mattresses to the voluntary standard AS/NZ 8811.1:2013, which outlines a method to detect mattress firmness.

Our results show:

  • which cot mattresses passed the firmness test, which involves placing a test apparatus at various locations around the mattress (including a worst-case scenario location decided on by the tester) and seeing whether it sinks too deeply into the surface. Some manufacturers whose products we failed have shown us lab results to say they have passed, but they will be reviewing their test and manufacturing procedures as well as packaging methods (eg vacuum-packed) to minimise any inconsistencies.
  • whether the claimed measurements match up with the actual measurements. We score a mattress down if the thickness is significantly more than stated, as this could end up being a fall risk depending on the depth of the cot (a cot should be a minimum of 50cm when the base is set in the lowest position, and 30cm in the upper position).

Our interactive comparison tool helps you find out which models are safe. Our Recommended list will help you see quickly which models come out on top.

Did you know CHOICE tests much more than just cot mattresses? Check out our Top 50 reviews.

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List of brands we tested in this review.

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The RRP at the time of testing. If the price is $0 this is because the mattress comes included with a cot and is not available for individual purchase. Check the good points for the model for more details.

enter value/s in increments of 1 between 0 and 526

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Passed firmness test

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Whether the cot mattresses pass the sleep surface test method for firmness, AS/NZS 9911.1:2013. Parents are advised by safety experts to always choose a 'firm' mattress to minimise the risk of sudden unexpected death in infancy (SUDI).

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The material the product claims to be made from.

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Removable cover

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Mattress weight (kg)

enter value/s in increments of 1 between 1.6 and 9.6

Measured length (mm)

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The length of the mattress according to our measurements. This may differ from the product's claimed length. 

enter value/s in increments of 1 between 1000 and 1345

Measured thickness (mm)

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The thickness or depth of the mattress according to our measurements. This may differ from the product's claimed thickness. 

enter value/s in increments of 1 between 65 and 180

Measured width (mm)

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The width of the mattress according to our measurements. This may differ from the product's claimed width. 

enter value/s in increments of 1 between 610 and 755

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