Joybuy Insights

Choosing a children’s mattress: how to compare dimensions, firmness and materials correctly

A children’s mattress needs to offer more than an appealing product photo might suggest. The key factors are the right dimensions, a suitable height, a clearly explained construction and a cover that is easy to care for in everyday family life. If you focus only on the price or terms such as “ergonomic”, you may end up buying a mattress that is unsuitable for the bed, your child’s height or the intended use.

Common pitfalls when buying a children’s mattress

1. Unsuitable dimensions are often underestimated

A mattress should not move around significantly in a child’s bed. Even a difference of just a few centimetres can create gaps between the edge of the mattress and the bed frame. Before buying, carefully compare the bed’s internal dimensions with the mattress dimensions.

Typical sizes include:

  • 60x120 cm baby cot mattress for many cots and bedside cots
  • 90x200 cm children’s mattress for single beds in children’s or teenagers’ bedrooms
  • 90x190 cm for compact children’s beds
  • 140x200 cm mattress for older children, teenagers or shared use by children and adults

The mattress height is also important. A 25 cm-high model will not automatically fit every bed and may alter the safety clearances where the bed has a low fall guard.

2. An H3 firmness rating is not automatically suitable for every child

The term H3 mattress describes a firm model, but it is not defined consistently throughout Germany. The actual feel also depends on body weight, the spring core, foam density and the cover. For children, the firmness rating should therefore not be the only deciding factor.

More important is the combination of:

  • suitable body weight and age
  • a stable, level base
  • sufficient ventilation
  • a secure fit in the bed frame
  • the manufacturer’s information about the intended user group

Babies have specific requirements. An adult mattress or a tall pocket-sprung mattress is not automatically suitable for a cot. For a 60x120 cm baby cot, only the appropriate dimensions and the specified safety instructions should be taken into account.

3. Marketing terms do not replace technical information

“Breathable”, “antibacterial” and “orthopaedic” are of limited value without further details. Buyers should check which materials are actually used and how the properties are described.

For example, a breathable mattress may feature an air-permeable cover and several ventilation layers. If a model is described as an antibacterial mattress, check the manufacturer’s specific information about its materials, care requirements and intended use. Such properties do not guarantee a particular hygienic or health-related effect.

Parameters to check before buying

Mattress core and noise levels

A pocket-sprung mattress consists of individually wrapped springs. These can move independently, helping to provide more differentiated pressure distribution. When combined with foam layers, they can also reduce the transfer of movement. Whether this is relevant in everyday use depends, among other things, on whether siblings or parents and children share the same sleeping surface.

Foam mattresses are often lighter and easier to turn. Spring mattresses, on the other hand, may offer better ventilation, but they require a suitable slatted base and are less convenient to carry.

Construction, height and care

Multi-layer models often combine memory foam, high-density foam, springs and a textile cover. Greater height is not automatically proof of quality. It must be suitable for the bed and must not make access more difficult for smaller children.

You should also look for:

  • a removable cover, or at least one that is easy to wipe clean
  • instructions for removing stains
  • a dry, well-ventilated position
  • regular turning, where recommended by the manufacturer
  • complete expansion after delivery in vacuum packaging

A mattress delivered rolled up should only be used once it has reached its intended shape. According to the product descriptions, the following GTIMEX models are stated to fully expand within approximately two hours. This time should be allowed for before use.

Bed, slatted base and what’s included

Not every product page includes a mattress. For example, a children’s bed with storage may only include the bed frame, drawers and slatted base. When comparing products, check the following points:

  1. Is a mattress included?
  2. What mattress dimensions are required?
  3. What mattress height is intended?
  4. Are assembly, the slatted base and fixing components included?
  5. Will the delivery arrive in one or several parcels?

Product selection for different user profiles

Suitable for: Budget-conscious first-time buyers
GTIMEX 7-zone pocket-sprung mattress 90 x 200 cm

GTIMEX 7-zone pocket-sprung mattress 90 x 200 cm

Why this product suits this profile: The size is suitable for a classic single bed in a child’s or teenager’s bedroom and comes with a fitted sheet.

How this product avoids the pitfall

The stated dimensions of 90 x 200 cm and the height of 25 cm make it easier to compare the mattress with the bed. The product description also mentions rolled delivery and the required expansion time.

Key benefits & strengths

7-zone construction, pocket springs with a diameter of 2.1 mm, nine material layers and a stated breathable cover.

Suitable for: Buyers with high quality expectations
GTIMEX 7-zone mattress 140 x 200 cm

GTIMEX 7-zone mattress 140 x 200 cm

Why this product suits this profile: The wide sleeping surface is designed for teenagers, adults or shared use in the family bedroom.

How this product avoids the pitfall

The product details specify the dimensions, height, H3 firmness rating, core construction and what is included. This makes it easier to compare the model with the bed and slatted base.

Key benefits & strengths

Nine layers, 7-zone construction, 2.1 mm pocket springs and a fitted sheet included according to the product description.

Suitable for: Special uses & frequent users
roba multifunctional cot bed with 60x120 cm baby cot

roba multifunctional cot bed with 60x120 cm baby cot

Why this product suits this profile: The set is aimed at families looking for a height-adjustable cot and toddler bed with several usage options.

How this product avoids the pitfall

The bed is specifically designed for a 60 x 120 cm sleeping surface. The product description also states that it has six height settings, includes a mattress and meets the safety requirements of EN 716–1:2017 + AC:2019.

Key benefits & strengths

Bedside cot, cot and toddler bed in one design; the package includes a slatted base, mattress, bed rails and canopy, among other items.

Looking for more options?

We have put together a complete, regularly updated list of products that fully meet these strict selection criteria and the safety regulations applicable in the EU.

FAQ about children’s mattresses

Which children’s mattress is suitable for a 90 x 200 cm bed?

For a bed with these internal dimensions, a 90x200 cm children’s mattress may be suitable. You must also check the mattress height, slatted base and fall guard. A 25 cm-high mattress may be unsuitable for a low children’s bed, even if the length and width are correct.

How long does a children’s mattress last?

Its service life depends on the materials, the level of use, care and ventilation. Regularly check for indentations, damaged seams, moisture and reduced stability. During periods of rapid growth or when moving from a children’s bed to a teenager’s bed, you should also check whether the size and sleeping properties are still suitable.

How do you care for a breathable mattress?

The mattress should be kept dry and aired regularly. Stains can be treated locally with a mild cleaning product in accordance with the manufacturer’s instructions. Direct heat, harsh cleaning products and moisture trapped inside for prolonged periods can damage the cover and core materials.