How to care for a baby’s cot mattress

Cot-mattress care starts with the instructions for the actual mattress. A washable cover does not mean the foam, springs or complete mattress can go in a washing machine. Keep the model details and care label available rather than relying on a generic cleaning recipe.

Check condition before cleaning

The Lullaby Trust’s mattress guidance calls for a firm, flat mattress that fits properly, with a waterproof cover and no tears or sagging. Cleaning cannot repair a damaged cover, restore a collapsed surface or make the wrong size fit.

A practical routine for spills

1. Remove the soiled bedding and inspect the mattress and its cover.
2. Find the separate care instructions for each removable item. Follow the specified washing method, temperature and drying instructions.
3. For the mattress surface, use only the cleaning method its manufacturer permits. Do not assume bleach, steam, soaking or a home-made mixture is suitable for every material.
4. Allow cleaned components to dry as instructed before reassembly. Refit the correct cover and check the surface and fit again.

If liquid has reached an inaccessible core, or you find water damage or mould, ask the manufacturer about replacement instead of covering the problem with an extra layer. Keep a suitable alternative sleep space available while the mattress cannot be used.

Protection should not change the sleep surface

Choose the correct fitted waterproof protection for the mattress and its instructions. Do not add a soft topper, folded duvet or extra mattress to make a cot feel more luxurious. Keep the baby’s sleep space clear.

Reusing a mattress

The Lullaby Trust generally advises a new mattress for each baby. Where that is not possible, its second-hand checklist covers condition, waterproof protection, firmness, fit and labelling. An attractive cover or a recent wash alone cannot establish its condition or history.

What care can achieve

Appropriate cleaning and inspection help maintain the mattress as intended. No mattress or cleaning routine guarantees prevention of SIDS; follow the full safer-sleep guidance. This article does not certify a particular mattress or prescribe a universal replacement age.