When should a child move from a cot to a bed?

That is a parenting and safety judgement, not a BedGuide rule. Furniture literacy means matching the next mattress size in centimetres and using the right guardrails for that product. Follow the bed maker’s age and weight guidance.

Is a UK Single the same as a kids mattress?

A UK Single (90 × 190 cm) is a standard adult single size that many older children use. Younger stages often use cot or smaller widths. Always measure.

Are bunk beds safe for any age?

No. Bunk and high sleepers have age, weight and guardrail rules on the product. Top bunks are not for very young children. See bunk beds and high sleepers.

sizing

Kids Bed Size Journey (Cot to Single)

Entity: kids bed size journey

Spacious bedroom with a large king size upholstered bed and clear walkways — Size is about width, length and walkway space — not only the name on the label.

In short

Children’s beds follow a size journey: cot or cot-bed, then toddler or small single, then a UK Single, and sometimes bunk or high-sleeper setups. Measure mattresses in centimetres. Safety rails, ladder clearance and weight limits matter as much as the size name. This maps usual stages — not childcare or medical advice. Follow current product safety instructions for any bed.

Educational size ladder from cot mattress to small single and UK Single for children’s rooms — Names change by age and room. Centimetres and safety instructions stay the real rules.

Dimensions (centimetres and inches)
Size name	Width (cm)	Length (cm)	Width (in)	Length (in)
Typical cot mattress (example band)	60	120	—	—
UK Small Single (common kids step)	75	190	—	—
UK Single	90	190	—	—

The usual size ladder

Cot / cot-bed mattress — size is model-specific (cot and small single)
Toddler or small single styles — often narrower than a full Single
UK Single 90 × 190 cm — common longer-term kids size (UK sizes)
Bunk / high sleeper — still usually Single-width mattresses with extra structure rules

Details for materials and firmness myths: kids mattress guide.

Safety checks that travel with every stage

Check	Why
Exact cm fit	Gaps at the edges are unsafe in cots and some bedrails
Guardrails / barriers	Product-specific height and gap rules
Ladder and head clearance	Especially for bunks and high sleepers
Weight limits	Frames and top bunks are rated
Firm, flat sleep surface for infants	Follow current safer-sleep guidance from health authorities — not mattress marketing

Bunk and high sleeper branch

When space is tight, families consider bunk beds and high sleepers. Assembly quality matters — see assemble a bunk bed.

Common mistakes

Buying “cot bed” bedding for a different centimetre size
Putting a soft adult pillow/topper in an infant sleep space against safer-sleep rules
Ignoring top-bunk age guidance to save floor space

Frequently asked questions

When should a child move from a cot to a bed?: That is a parenting and safety judgement, not a BedGuide rule. Furniture literacy means matching the next mattress size in centimetres and using the right guardrails for that product. Follow the bed maker’s age and weight guidance.
Is a UK Single the same as a kids mattress?: A UK Single (90 × 190 cm) is a standard adult single size that many older children use. Younger stages often use cot or smaller widths. Always measure.
Are bunk beds safe for any age?: No. Bunk and high sleepers have age, weight and guardrail rules on the product. Top bunks are not for very young children. See bunk beds and high sleepers.