How do I clean a cot mattress?
Short answer: Wipe the waterproof cover and follow the maker's care label. Replace it if the cover tears or the core gets wet or starts to sag.
Here is the detail behind that answer, taken from current UK guidance from the NHS and the Lullaby Trust.
Things to check
- Measure the inside of the cot. The mattress should fit with no gaps.
- Choose firm, flat and waterproof. Your baby's head should sink no more than a few millimetres.
- Check for a fire-resistant label and the relevant British Standard.
What the guidance says
- The Lullaby Trust recommends a new mattress for each baby where possible. A second-hand one should have a 100% waterproof cover, no rips, tears or water damage, no sagging, a good fit and a fire-resistant label.
- The Lullaby Trust recommends a waterproof mattress protector, because it can be wiped clean.
Related questions
What is a cot mattress?
A firm, flat mattress for a standard cot, usually 120 x 60cm.
Shop at Baby Kingdom
Browse cot mattresses 120 x 60
- Tutti Bambini Eco Fibre Cot Mattress (60 x 120 cm)
- Obaby Foam Cot Mattress 120 x 60 cm
- Tutti Bambini Sprung Cot/Cot Bed Mattress
- Tutti Bambini Eco Fibre Deluxe Cot Mattress (60 x 120 cm)
Check each product page for its exact dimensions, mattress size, age and weight limits and safety standards.
More advice
Travel cot mattress buying checklistGuide to mattress protectors: what to look forCot bed mattresses buying guide for UK parentsCan a 6 month old sleep on a raised or tilted mattress for reflux?Guide to space saver cot mattresses 100 x 50: what to look forCot bed mattresses buying guide for UK parentsAll cot and baby mattresses advice →
Sources
- The Lullaby Trust: Baby mattresses and bedding (accessed 2026-10-21)
General information only, not medical advice. Always follow your product's instructions. If you are worried about your baby, contact your GP, health visitor or 111. In an emergency, call 999.