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Kids Mattresses

We have an impressive collection of mattresses for kids, so whether you need a new bunk bed mattress, or something waterproof for a potty-training toddler, you'll find what you're looking for.

52 results


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Based on 22,124 reviews

Trustpilot Star rating Verified

It was very easy to order, with great prices. Delivery was quick, received text and was called before delivery on timings. Great service and would recommend mattress nextday.

Jc 11th Apr
Trustpilot Star rating Verified

I have used this company in the past and I am never dissapointed. Beautiful mattress arrived promptly and delivered by polite and courteous delivery drivers. My mattress was even better than I expected for the price I paid. Would recommend this company very highly.

Mrs D From Cambridge 11th Apr
Trustpilot Star rating Verified

Perfect experience. Sitting at home on a saturday optimistically googling fast delivery mattress and mattressnextday popped up. A zip and link superking size isnt the easiest thing to find quickly. 8am on monday two nice gents took away my old one and delivered a really nice sleepezee firm mattress on time and with no fuss. Just a big thank you for such a unique company when everyone else was 1-6 weeks.

Mr C Roberts 11th Apr

Which mattress will be best for my children?

Available in all firmness levels, our children's mattresses can be tailored to the specific requirements of your child. Sleep is very important to a child’s development, and as such it’s crucial they receive the right amount of comfort and support. With children’s mattresses from leading brands such as Silentnight on offer, our selection of high value kids bed mattresses will help your little ones get a great night’s sleep. 

Should a mattress for kids be firm or soft?

Striking a balance between kids’ mattress firmness ratings depends on the sleeping preferences of the individual. Choosing a mattress with a softer feel is better suited to older kids or children who sleep on their side or back.

The stability of a firm mattress is ideal for front sleepers and younger children who require additional support, promoting a healthy spinal alignment. Kids mattresses at all ends of the firmness scale can be purchased from MattressNextDay.

What sizes are available for kid's mattresses?

While you can use standard single, double and even king-size mattresses for kids, there are a variety of mattresses that are especially suited to kid’s cots, cot beds and bunk beds as well as bed frames. Those sizes include: 


Size Dimensions

Cot mattresses

120cm x 60cm / 47" x 23" 

Cot bed mattresses

140cm x 70cm / 55" x 27" 

Shorty mattresses

75cm x 175cm / 190cm x 90cm 

Bunk bed mattresses

190cm x 75cm / 2'6" x 6'3" (small single)

or 190cm x 90cm / 3' x 6'3" (single)

Small single

190cm x 75cm / 2'6" x 6'3"


190cm x 90cm / 3' x 6'3"

Small double

190cm x 120cm / 4' x 6'3"

For more information on kid's bed sizes, read our Ultimate Guide to Kid's Bed Sizes.

What type of kids’ mattress is best for a child?

As with adult mattresses, there are an array of options available for kids. Our extensive range has been curated to help you find a kid’s mattress which matches your child’s specific requirements.

Pocket Sprung

Kids pocket sprung mattresses are designed with cloth-wrapped springs which offer support while responding to your child’s movements and weight.

Memory Foam

Suitable for a restless child, a memory foam mattress promotes a consistent sleeping position by conforming to their body shape. Children have greater difficulty regulating their body temperature at night, and as memory foam can feel warmer, you may want to pick one that has Coolgel properties or is designed specifically for kids and has better airflow qualities.  

One of the big benefits of memory foam is that it is hypoallergenic, so it’s perfect for young children who may suffer from sensitive skin, allergies, or asthma. Memory foam is also durable and long-lasting. To protect the surface, you can add a waterproof mattress protector which can be easily cleaned in the event of any little night-time accidents. 


These natural kid’s mattresses are breathable, making them adept at encouraging a consistent airflow as your child sleeps. Latex mattresses are suited to children who get hot at night. The luxurious finish of the smooth latex is designed to improve comfort.


Kids waterproof mattresses feature a tough top layer which won’t become damaged by moisture. A suitable mattress to protect against bedwetting, the waterproof surface will also effectively deal with spills of any kind.

Our child mattresses each have a minimum guarantee of 12 months. Select models are further protected by an additional 5-year warranty for additional assurance of quality. Depending on stock, our child mattresses can be with you in as little as 24 hours thanks to our nationwide next day delivery service. 

Are children’s mattresses anti-allergy?

Kids are susceptible to allergy-related irritations and bed bugs. This can be disruptive to their quality of sleep and the hygiene of their sleeping environment. A large percentage of our kid’s mattress range have hypoallergenic properties, helping young sufferers of asthma and other allergies to get to sleep. Opt for memory foam, latex, or natural fillings if you require an anti-allergy child’s mattress.

Should you add a kids mattress protector?

Taking care of your kid’s mattress is important to making the most of its lifespan. Designed to shield against bedwetting or spills, mattress protectors help defend against damage and wear and tear associated with moisture. Each mattress protector is easy to wash and comfortable, keeping the mattress fresh and dry.

Size Imperial Metric
Cot Mattress 3'9" x 1'9" 120cm x 60cm
Cot Bed Mattress 4'6" x 2'3" 140cm x 70cm
Adjustable Small Single 2'6" x 6'6" 75cm x 200cm
Adjustable Single 3' x 6'6" 90cm x 200cm
Adjustable Small Double 4' x 6'6" 120cm x 200cm
Adjustable Double 4'6" x 6'6" 135cm x 200cm
Small Single 2'6" x 6'3" 75cm x 190cm
Single 3' x 6'3" 90cm x 190cm
Small Double 4' x 6'3" 120cm x 190cm
Double 4'6" x 6'3" 135cm x 190cm
King Size 5' x 6'6" 150cm x 200cm
Super King 6' x 6'6" 180cm x 200cm
European Small Single 2'8" x 6'6" 80cm x 200cm
European Single 3' x 6'6" 90cm x 200cm
European Double 4'7" x 6'6" 140cm x 200cm
European King Size 5'3" x 6'6" 160cm x 200cm

All mattress sizes given are approximate and stated sizes refer to the sleeping surface only. Mattresses sizes may vary slightly from their stated dimensions due to manufacturing tolerances, please allow +/- 2 inches (5cm).

Support Best for
 Icon for Memory Foam Memory Foam Body moulding and pressure relieving
 Icon for Natural Fibres Natural Fibres Unrivalled comfort, naturally temperature-regulating
 Icon for Latex Latex Breathable, supportive and eco friendly
 Icon for Cool Gel Memory Foam Cool Gel Memory Foam Active cooling properties, ideal for hot sleepers
 Icon for Soft White Fibres Soft White Fibres Hypoallergenic polyester, soft and durable

Support Best for
 Icon for Pocket Springs Pocket Springs Individual springs for tailored support
 Icon for Foam Foam Conforms to your body's shape, silent (no springs)
 Icon for Open Coil Springs Open Coil Springs Traditional, interlinked springs
 Icon for Pocket Springs Latex Bouncy yet supportive, great for hot sleepers

Firmness Best for
Good for side sleepers, a softer level of support
Good all-rounder for front, side or back sleepers
Medium - Firm
Good for people who change sleeping position
Good for people who sleep on their front or back
Extra Firm
The firmest level of support, also known as orthopaedic