The Best Cot Bed Mattress 2021

Up to the age of 24 months, most babies will spend the majority of their life on their cot bed mattress. The best provide optimum comfort whilst remaining firm, which is required to support the growth of your baby.

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Best Cot Bed Mattress
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Newborn babies will spend a lot of their time relaxing within the cot and it’s crucial that you purchase the correct cot bed mattress. This improves the chance of them having a good night sleep as well as supporting their growing body.

If you require a quick answer, the best cot bed mattress is the KATY® Superior Deluxe, which meets all the latest UK safety standards and provides your baby with superior comfort and support. However, if you are on a tight budget, the Mother Nuture Classic is the best alternative.

Most mattresses used for cots are 140 x 70 or 120 x 60 cm  in size but most have a tolerance in size of a few millimetres. If you own a baby travel cot, you may need a smaller mattress size to accommodate the internal space inside of the cot.

In terms of rating the cot bed mattresses in this article, we based our recommendations upon research and a number of factors. The factors that were considered included their available sizes, waterproof qualities, construction, UK safety standards, cover quality and value for money.

Cot Bed Mattress Comparison

Cot Bed MattressSize(s)
KATY® Superior Deluxe140 x 70 cm
The Little Green Sheep140 x 70 cm
Mother Nuture Classic140 x 70 cm
Silentnight Safe Nights Luxury140 x 70 cm & 120 x 60 cm
Clevamama ClevaFoam140 x 70 cm & 120 x 60 cm
Obaby Natural Coir Wool140 x 70 cm
Kinder Valley Flow140 x 70 cm

Before purchasing any of the mattresses recommended, we highly advise that you double check the dimensions of the cot. You will want to measure the internal dimensions of the cot to find a mattress that is best suited to your requirements.

Below is a list of the best cot bed mattresses that provide excellent comfort and support for your baby whilst they sleep.

The Best Cot Bed Mattress

1. KATY® Superior Deluxe Spring Cot Bed Mattress

KATY® Superior Deluxe Spring Cot Bed Mattress
The KATY® brand produce a wide range of mattresses in the UK but this CHMR28 mattress is designed for cot bed. It’s made to fit any standard UK cot bed or junior bed with a size of 140 x 70 cm.

In order to maximize the safety of your baby, the brand state that it’s been constructed without the use of antimony, phosphorus or arsenic based fire retardants.

Other features of the KATY® CHMR28 Deluxe include:

  • Made in the UK
  • Uses a high grade density foam
  • Robust spring unit for max comfort and support
  • Removable quilted cover for washing
  • Adjustable waterproof membrane
  • Standard 140 x 70 cm size

This cot bed mattress by the KATY® brand combines superior quality and value for money into a single package. It’s made in the UK to the highest of standards and is designed to fit standard cots or junior beds.
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2. The Little Green Sheep Natural Twist Cot Mattress

The Little Green Sheep Natural Twist Cot Mattress
By far the most expensive cot bed mattress within this article is by the Little Green Sheep brand. It’s a dual sided mattress with one firm side for babies up to 12 months and another natural latex side for babies older than 12 months.

A unique fact about this mattress is that the construction is handmade and uses only four natural ingredients, which include cotton, coconut coir, wool and natural latex.

Other features of the Little Green Sheep Mattress include:

  • Award winning in the UK
  • Dual sided – one firm side and the other is natural latex
  • Suitable from birth to 5 years of age
  • Breathable cotton and comfy natural latex
  • Standard size of 140 x 70 cm
  • No chemicals used in the construction
  • Requires a protector as it’s not waterproof

Due to the expensive price tag, this cot bed mattress will not be suitable for everyone. However, when you consider that it can be used from birth up to 5 years of age and superior handmade quality, it makes it a worthwhile investment.
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3. Mother Nurture Classic Spring Cot Bed Mattress

Mother Nurture Classic Spring Cot Bed Mattress
Another highly popular mattress for a cot bed is by the reputable Mother Nuture brand. It’s professionally manufactured in the UK and the brand states it meets all of the latest British standards for complete peace of mind.

Included with the cot bed mattress is a hypo-allergenic luxury bound cover, which is water resistant and removable for machine washing.

Other features of the Mother Nuture Classic Spring include:

  • 140 x 70 x 10 cm
  • Hypo-allergenic luxury bound cover
  • Bound edges for extra resilience and durability
  • Removable zip covers
  • Contains no organophosphate fire retardants
  • Meets all the latest UK safety standards
  • Water resistant and machine washable cover

If you are worried that your baby may suffer against allergens, this cot bed mattress is an excellent option. It focuses on providing protection for the baby with a hypo-allergenic cover and toxic-free construction. Overall, the Mother Nuture offers excellent value for the money and can be easily washed thanks to removable zip coves.
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4. Silentnight Safe Nights Luxury Cot Mattress

Silentnight Safe Nights Luxury Cot Mattress
Silentnight are a highly reputable brand across the UK and specialize in mattresses. This luxury cot bed mattress is a standard 140 x 70 cm size that is suitable to use from birth with a firm construction with no dipping or sagging.

For complete peace of mind, the brand state that its constructed of chemical free fibers that are free of any nasty chemicals or odours.

Other features of the Silentnight Luxury Cot Mattress include:

  • Available in a 120 x 60 or 140 x 70 cm size
  • Completely flat and firm for newborns
  • Filled with mini pocket springs
  • Breathable fabric and fillings to promote airflow
  • Removable and washable cover
  • Handmade in the UK
  • Includes a 3 year guarantee
  • Foam and chemical free

As you would expect with any Silentnight mattress, it does come with a premium price tag but it’s one of the best available. It’s handmade in the UK, tested to the highest of UK standards and even comes with a three year guarantee.
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5. Clevamama ClevaFoam Support Cot Bed Mattress

Clevamama ClevaFoam Support Cot Bed Mattress
The Clevamama ClevaFoam is a highly rated option that the brand states is “pure luxury” with a comfortable mattress that provides plenty of support. It has a unique six part breathable composition that supports the development of a fast growing baby and relieves pressure on their joints.

ClevaFoam is the brands patented technology that is scientifically proven to prevent flat head syndrome and remain breathable for a relaxing night sleep.

Other features of the Clevamama ClevaFoam include:

  • Available as a 120 x 60 or 140 x 70 cm size
  • Proven to reduce flat head syndrome
  • Breathable and hypoallergenic
  • Includes a machine washable cover
  • Safety certified and non-toxic
  • Lightweight and breathable

Clevamama is a very popular brand and known for their high quality products and this cot bed mattress follows that great reputation. It ticks all the boxes in terms of safety, comfort and support and it’s an excellent all-round option.
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6. Obaby Natural Coir Wool Cot Bed Mattress

Obaby Natural Coir Wool Cot Bed Mattress
Another premium mattress for the cot bed is the Obaby Natural Coir Wool option, which is backed by a 5 year guarantee. Also included is an organic bamboo zipped cover that is tough on bacteria and odours.

In terms of the construction, the inner core is made from a coconut coir, which is bonded with latex. The core is then wrapped in lambs wool that helps to protect against anti-dust mite and regulate the baby’s body temperatures.

Other features of the Obaby Natural Cot Bed Mattress include:

  • 140 x 70 x 10 cm in size
  • Organic bamboo removable cover
  • Coconut coir and lambswool inner core
  • Guaranteed for 5 years in the UK
  • Meets or exceeds various safety regulations

Although expensive, the Obaby Natural mattress is a soft and breathable option that help ensure your baby has a good night sleep. The brand also produces other cot bed mattresses that are suitable for moisture management, all season and much more.
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7. Kinder Valley 140 x 70 Flow Mattress

Kinder Valley 140 x 70 Flow Mattress
If you require a cheap cot bed mattress that meets the latest safety standards and is comfortable for the baby, the Kinder Valley Flow is perfect. It’s constructed of a high density polyester pad that offers support and is soft to touch.

Other features of the Kinder Valley Flow include:

  • 140 x 70 cm in size
  • Nursery grade polyester pad insert
  • Suitable to use from birth
  • Protective cover that protects against dust mites
  • Water resistant but still breathable
  • Meets BS1877 part 10 and BS7177 standards

Overall, it’s a cheap and safe mattress that slots straight into the cot and can be used for newborns and toddlers. Unlike similar priced alternatives, it’s a nursery grade mattress and Kinder Valley also provide an anti-allergenic cover.
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How We Rated The Cot Bed Mattresses

As there are hundreds of cot bed mattresses to choose from, picking the best out of the bunch can be quite difficult. However, we based our recommendations upon research and a number of factors. The factors that were considered included their available sizes, waterproof qualities, construction, UK safety standards, cover quality and value for money.


All of our recommended mattresses for cot beds are designed to be comfortable and support the growth of your baby. It’s highly advised to purchase a waterproof cover if not provided as it will help prolong the life of the mattress.

The Author Who Worked On This Article

author charlotte darimo

Charlotte Rebecca

Charlotte is a mum, animal lover and somebody that loves their hair and beauty products. From being a mum and enjoying her hobbies, she has been able to test a range of products, create informative guides and give her own opinions.

If you would like to read more about Darimo and the authors, you can visit our about page. This goes into great detail regarding how we test products, create our guides and everything else.

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