Choosing a cot mattress is about more than comfort. For babies and toddlers, the mattress needs to feel firm, fit the cot properly and be easy to keep clean, so their sleep space stays supportive and hygienic night after night.
Given lots of information about different types of mattresses. Their quiz to help find most suitable for needs was very useful. Delivery was quick and delivery man very helpful. Great variety of mattresses to chose from. Would definitely recommend company.
Next day delivery friendly helpful delivery team great mattress firm and comfortable slept well top marks so far
Very positive experience. Ordering process was easy and updated on the order status. Delivered next day with good communication from the courier.
Very happy with price and quality of mattress and your delivery men were very helpful and nice to deal with.
Excellent service the bed came on the day I chose. Its well built and the delivery team were brilliant too. I would definitely recommend to others.
Delivered during the time slot specified with text updates. Easy to order from website and the next day service works perfectly
Delivery was on time, although email said they might be running late and team was friendly. And mattress is just what I wanted.
Best mattress i've ever bought . Excellent quality. Arrived the next day . Excellent delivery service.
Quick and easy to use the website good communication on delivery and delivered on time as promised. Registration for warranty was quite simple too. Cutting provided with one mattresses great for safely unpacking the mattresses. Overall happy with service provided, time will tell how good the mattresses are.
Excellent service and very quick delivery. Mattress is just what I was hoping for. Very comfortable and supurb quality.
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A cot bed mattress, or a crib mattress, is designed for babies and toddlers, so its priorities differ from those of an adult mattress. Instead of a soft, sink-in feel, younger children need a mattress that feels firm, flat and supportive.
The right cot bed mattress should also fit the frame closely, without gaps around the edges. Removable or wipe-clean covers can make everyday clean-ups easier, especially through nighttime accidents, spills and toddler years.
Start with the cot or cot bed frame you already have. The safest mattress is the one that properly matches the frame size, sits flat, and leaves no gaps along the sides.
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Size: Check whether your cot needs a 120cm x 60cm mattress or a larger 140cm x 70cm cot bed mattress.
Fit: Measure the inside of the frame, not the outside, so the mattress sits snugly without being squeezed or leaving gaps.
Firmness: Choose a mattress designed to feel firm and supportive for babies and toddlers, rather than soft or deeply cushioned.
Hygiene: Look for removable, washable or wipe-clean covers to make accidents easier to manage.
Breathability: Breathable materials can help air move through the mattress, which is useful for a fresh and comfortable sleep space.
Next day delivery - Choose an eligible in-stock cot mattress and get free next-day delivery across the UK mainland.
Lowest price promise - Compare cot bed mattresses from trusted brands with added price reassurance.
Old mattress removal - Add old mattress removal at checkout and make switching to a natural mattress easier.
Excellent reviews - Read verified customer reviews to compare comfort, service and delivery before you buy.
Award-winning retailer - Order from a three-time NBF Online Bed Retailer of the Year.
British-designed quality - Shop British-designed mattresses made with carefully selected fillings, fabrics and support systems.
Tell us who the mattress is for, the size you need and the feel you prefer. MattressFinder™ will help narrow the range to mattresses that suit your sleep needs. Find your perfect mattress.
What should parents look for in a cot bed mattress?
The most important things to check are fit, firmness and hygiene. The mattress should sit flat in the bed frame, feel firm and supportive, and fit snugly with no gaps around the edges.
For peace of mind, look for a mattress designed specifically for babies and toddlers, not a cut-down version of an adult mattress. The surface should feel supportive rather than soft or sink-in, and the cover should be practical enough for everyday nursery use.
What size cot bed mattress do you need?
The most popular size for cot mattresses is 120cm x 60cm, while for cot bed mattresses, which are designed for older toddlers, the common dimensions are 140cm x 70cm. These two sizes should fit most cots and cot beds without being pushed up at the ends or squeezed on the sides. The mattress should lie flat to make sure your little one has a comfortable night’s sleep.
Our top tip: Measure twice, buy once! Remember to measure the interior dimensions of your crib, cot, or cot bed (not the exterior) to ensure your mattress fits perfectly.
What should a cot bed mattress feel like?
A cot bed mattress should feel firm, flat and comfortable. Babies and toddlers do not need a soft, cushioned mattress in the same way an adult might.
If you press gently on the surface, it should feel supportive and return to shape. Avoid using a mattress that sags, dips, feels overly soft or no longer sits level in the frame.
What cover should a cot bed mattress have?
Look for a cot bed mattress with a practical, easy-to-clean cover, or buy waterproof bedding to go alongside it. Removable, washable or wipe-clean covers can make everyday accidents easier to manage without leaving the mattress feeling damp or difficult to refresh.
A waterproof inner layer or suitable mattress protector can also help protect the mattress core. Before ordering, check the care instructions to know how to clean the cover and whether it can be removed for washing.
Free next-day delivery to most locations - Choose an eligible in-stock cot mattress and get free next-day delivery across most UK mainland locations.
Free weekend delivery - Choose a weekend delivery slot, if available, so your mattress arrives when it is easier for someone to be home.
Choose a delivery date - Pick your preferred delivery date at checkout to make it easier to plan around work, moving day, or replacing an old mattress.
Just £39 to responsibly dispose of your old mattress - Add old mattress removal at checkout, and MattressNextDay will take care of your old mattress when your new one arrives.
100% of your mattress is reused and recycled - Every mattress is broken down into its core components so the raw materials can be repurposed instead of going to landfill.
A greener way to get rid of your old mattress - Avoid the hassle of arranging disposal yourself and choose a recycling service that is designed to be convenient and work around your needs.
Looking for a supportive mattress for your baby or toddler? Explore the latest MattressNextDay sale and compare nursery and children’s mattresses by size, cover type, support and delivery availability. Shop mattress sale.
Choosing a cot bed mattress can feel more important than choosing your own. Parents want to know their baby or toddler has a mattress that fits properly, feels supportive and is easy to keep clean.
Martin Seeley, Product Expert at MattressNextDay, answers common questions about cot bed mattress sizes, firmness, hygiene and delivery.
No. Some cots use a 120cm x 60cm mattress, while many cot beds use a 140cm x 70cm mattress.
The mattress should fit the frame snugly and lie flat, without gaps around the edges.
A cot bed mattress should feel firm and flat. It should support your baby or toddler evenly and should not sag, dip or feel overly soft.
Many cot bed mattresses are around 10cm thick, but you should always check the cot or cot bed manufacturer’s guidance. The mattress needs to fit the frame safely and leave the correct height around the sides.
A new mattress is usually preferred for a baby. If you do use an existing mattress, it should be firm, flat, clean, dry, waterproof, in good condition and fit the cot with no gaps.
Do not use a mattress that is torn, sagging, damaged or no longer lies flat.
Some cot bed mattresses include a waterproof or wipe-clean cover, while others may need a separate protector. Check the product details before ordering.
A waterproof layer can help protect the mattress from accidents and keep the sleep surface easier to clean.
Some cot bed mattresses are made with hypoallergenic or anti-allergy materials, but this varies by product.
Check the full product specification if allergies or sensitivities are a concern.
Replace a cot bed mattress if it no longer feels firm and flat, has started to sag, is damaged, has a torn cover, or no longer fits the frame properly.
A mattress should also be replaced if it cannot be cleaned or dried properly after an accident.
Selected in-stock cot bed mattresses are available with free next-day delivery across the UK mainland. See the delivery page or individual product pages for the latest information.
*Delivery charges may apply for some areas. Please see our delivery page for more information.
1. Order by 6pm for next day delivery between Monday-Friday, 12pm on Saturday and 3pm on Sunday. The 'Order by' time may be subject to change dependant on our delivery partners.
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