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Kids Beds Buying Guide

Buying a bed for yourself is easy, but when it comes to choosing a bed for your children, there are many factors to consider: the style, the kid's bed size that you want, the safety features, and how long it's going to last.

In this Happy Beds Kids' Bed Guide, we're going to talk about everything from cots to sleep stations to help you choose the perfect good quality children's bed for your little one!

Kids' Bed Size Chart

When considering which bed size is best, we always advise choosing a mattress size and bed frame that leaves enough room for your child to grow. This will maximise the lifespan of the product and not leave your children in an unsuitable bed for a lengthy period of time.


If you are unsure of where to start, take measurements of your child's bedroom to get a rough idea of the space available to you. After that, consult the mattress size chart below to find the perfect bed size.


While you may not be in the market for a new mattress, using mattress size is the best way to pick the right bed size for your child. We have included a recommended age range too, but every child is different, so these age ranges may differ slightly.


Mattress or Bed Type Mattress Size (WxL) Recommended Age Range
Cot 1'9" (60 cm, 21") x 3'9" (120 cm, 47") 0 - 2 years
Toddler Bed/Cot Bed 2'3" (70 cm, 27") x 4'6" (140 cm, 55") 2 - 4 years
Small Single Bed 2'6" (76 cm, 30") x 6'3" (190 cm, 75") 4 years and up
Single Bed 3'0" (90 cm, 35") x 6'3" (190 cm, 75") 4 years and up
European Single Bed 3'0" (90 cm, 35") x 6'6" (200 cm, 78") 4 years and up
Small Double Bed 4'0" (120 cm, 47") x 6'3" (190 cm, 75") 8 years and up

While the toddler bed age range and cot bed age range are relatively set in stone, each child will transition to a "big kid's bed" at different times. It's not unfamiliar for a child to transition to a small single or a single bed before the age of 4, for example.


In fact, transitioning to a new bed is a big moment in a child's life. to make the process easier - and to find the averages ages of transition - take a look at 'Transitioning Your Child to a New Bed: The Essential Guide'.


If you're set on a mattress and bed size but you're confused about which mattress type is the best for your little one, then read our in-depth blog 'How To Choose the Right Mattress for your Child'.

What are the best toddler beds?

There is no one answer as to which is the best toddler bed, as that's purely dependent on you and your child.

But rest assured, all of our toddler beds are designed to uphold strict safety standards! To keep your child safe as they sleep, a toddler bed will usually have raised sides that will help to prevent them from rolling out of bed during the night.

Regarding what kinds of toddler beds are available, we have a wide range of fun toddler character beds with bright and colourful designs. This makes bedtime comfortable for them and exciting as they get to sleep next to their favourite characters!

Make sure to choose a toddler mattress that has been specifically designed to fit into these unique beds. All of our kids' mattresses are designed to support your child as they sleep and grow.

What age do children go into a bed?

Whilst it may be enticing to immediately upgrade your little one from a cot to a big kid's bed, it's essential to consider their age as each age bracket should ideally use a different bed. As there are many types of children's beds, we've put together this helpful list to help you get a better idea of what children bed size is best for your child.

  • Cot bed - for children under the age of 2, we recommend they continue to use a cot that will help provide safety as they sleep, thanks to the high sides.
  • Toddler bed - toddlers aged between 2 - 4 years should then be upgraded to a toddler bed. These don't have the high safety rails that cot beds do, but instead, they simply have raised sides to help reduce the risk of them falling out of bed in the middle of the night.
  • Low sleepers - ideal for the age of 4 and up, low sleepers are easily accessible due to being low to the ground.
  • Mid sleepers and high sleepers - we recommend that these beds are for children aged above 6 due to the increased height, making them only suitable for older children.
  • Bunk beds - the top bunk of a bunk bed should be used only by children over the age of 6 to help increase safety, whilst children can use the bottom bunk over the age of 3.

When purchasing a kids bed for your child, it's equally important to make sure you keep the kid's bed size in mind, as kids mattress sizes are not always the same as an adult bed. Toddler beds will want a toddler mattress, and so forth!

How do I transition my toddler to a bed?

There will come a time when your little one needs to transition from a cot to a bed. Whilst there's no real answer to the question of what age do children go into a bed, you will most likely have gotten an idea that your child is ready to transition up to a bigger bed.

Most importantly, you might want to consider whether a toddler bed may be the ideal transitioning bed for them before moving up to a big kids bed. This is because a toddler bed often has fun and colourful designs while also low to the ground and still having essential safety features such as practical side barriers.

For more useful tips on successfully transitioning your toddler to a bed, check out our guide on Transitioning Your Child To A New Bed!

What age can kids go in bunk beds?

We recommend that children under the age of 6 should not be allowed on the top bunk, and those aged under 3 should not be on a bunk bed at all. While our bunk beds adhere to the strictest UK Safety Standards and include many features, including raised side railers and fixed ladders, we specify this particular age range for more safety.

As such, our age recommendations are because the top bunk of a bed is much harder to access than the bottom bunk, and it also comes with the added risk of a potential fall from height that could cause a young child potential injury.

If you want to learn more about bunk bed safety, then read our detailed blog on the subject 'What You Need To Know About Bunk Bed Safety' or check out our Bunk Bed FAQ's for more helpful information.

Which mattress is best for my child?

The right kids' mattress for your child depends on many factors, including how they sleep or what they are like whilst they are sleeping. Three of the most important factors to consider are the below:

  • Constantly moving - if your child is a chronic fidgeter whilst sleeping, they will want a mattress capable of providing plenty of support to avoid waking them up. A pocket spring mattress contains individually pocketed springs that operate independently from each other, absorbing your child's movement whilst keeping them asleep!
  • Overheating - keeping your child cool during the night is very important, as children can often end up getting very hot quite quickly. Cooling mattresses or mattresses with natural fillings that are temperature-regulating such as cotton, are the perfect solution here.
  • Needing extra support - children need plenty of support for their growing bodies as they sleep, which is why we'd recommend a medium mattress or medium/firm mattress!

Of course, each child is unique, so what might work for one child might not work for another, so it's essential to carefully assess what you think your child needs. The good news is that all Happy Beds mattresses and beds marketed towards children will have been manufactured to the highest safety standards, so you can be assured that your child will be comfortable and safe.

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