Cot & Cot Bed Mattresses

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What is the difference between a cot mattress and a cot bed mattress?

A cot mattress is designed for a standard cot, used from birth until your child moves to a bigger bed. A cot bed mattress is larger, made for cot beds that convert into toddler beds. The two aren't interchangeable, so always check the size of your cot before buying.

What size is a cot mattress?

The standard cot mattress size in the UK is 120 x 60cm. This is designed to fit most standard cots without any gaps. For the perfect fit and your little one's safety, always measure the internal dimensions of your cot before ordering your mattress.

How thick should a cot mattress be?

Cot mattresses should typically be 10 to 13cm thick, giving firm support while keeping the cot sides at a safe height. The mattress top should sit at least 50cm below the top of the cot rails, so avoid anything thinner than 10cm or thicker than 15cm.

How firm should a cot mattress be?

Firmness matters more than comfort preference when choosing a cot mattress. A firm baby cot mattress supports developing bones, keeps the spine aligned, and stops the surface dipping around your baby's face, reducing suffocation risk. When pressed, it should spring back quickly with minimal give. All our cot mattresses are built firm for safe, supportive sleep.

What type of cot mattress is best?

The best cot mattress for your baby depends on their age, any sensitivities, and your budget. Whichever option you pick, all our cot mattresses comply with the British Standard for domestic mattress safety (BS 7177).

• Foam cot mattresses: Lightweight and easy to handle during sheet changes, foam cot mattresses offer firm support at an accessible price. Modern foam uses open-cell structures for breathability, often with hypoallergenic treatments, making it a good choice for newborns.
• Pocket sprung cot mattresses: Individual springs respond to your baby's shape and movement, offering enhanced breathability and durability as they grow.
• Memory foam cot mattresses: A memory foam cot mattress provides pressure relief while keeping the firm support babies need.
• A natural or organic cot mattress swaps synthetic foam for materials like coir, wool or cotton, for parents who prefer fewer processed materials in their baby's sleep space.

How do I know when to replace a cot mattress?

Replace your baby's mattress if you spot any of the following:

• Sagging, lumps or visible wear
• Stains that won't lift, or a lingering odour
• Torn or damaged covers
• It is no longer big enough to support your child comfortably
• It's older than the manufacturer recommends, or was previously used by another child

What size is a cot bed mattress?

The standard cot bed mattress size in the UK is 140 x 70cm. It's not the same size as a standard cot mattress, since cot beds have a larger frame to support older babies and toddlers. Measure your cot bed before ordering, as sizes vary by manufacturer.

What type of cot bed mattress is best?

Choosing the best cot bed mattress depends on your child's age and how long you want it to last.

• Foam cot bed mattresses: Firm, lightweight support at a lower price point, well suited to the early cot bed years.
• Pocket sprung cot bed mattresses: Individual springs adjust to your growing child's shape, offering durability as they get heavier and more active.
• Cot bed memory foam mattresses: Offer pressure relief while still supporting toddlers transitioning from a cot.
• Natural and organic cot bed mattresses: Made from materials like coir or wool, these suit parents wanting fewer synthetic materials in their child's mattress.

Are your cot and cot bed mattresses waterproof?

Many of our cot mattresses and cot bed mattresses feature waterproof, easy-clean covers built to handle spills and leaks. These protect the core from moisture while staying breathable, so there's no uncomfortable plastic feel. For extra protection, we recommend using a waterproof mattress protector alongside your cot mattress from day one.

Are your cot and cot bed mattresses hypoallergenic?

Yes. Every cot mattress and cot bed mattress we stock meets British Standard BS 7177 for safety, with hypoallergenic, non-toxic materials that protect delicate skin. Breathable covers and ventilated cores improve airflow and reduce overheating risk, helping your baby sleep comfortably while keeping the mattress fresher for longer.

How to clean a cot mattress

Keeping a cot mattress clean is essential for your child’s health and helps extend its lifespan. Regularly vacuum the surface using an upholstery attachment to remove dust and allergens, and air the mattress occasionally in a well-ventilated room to keep it fresh. For spills or accidents, blot the area straight away with a clean cloth, then gently clean using a small amount of mild detergent and water. Avoid soaking the mattress, as excess moisture can lead to mould. Using a waterproof mattress protector from day one is highly recommended, as it protects against leaks while remaining breathable and makes cleaning quicker and more hygienic.