Cot Bed Mattresses
The cot bed mattress (70 x 140cm) fits convertible cot beds: a larger cot that transforms into a toddler bed and lasts well beyond the first year.
Why this size?
- Cot beds convert to toddler beds, so the mattress is typically used until around age four.
- It's 10cm wider and 20cm longer than the standard cot size.
- The same mattress serves both cot and toddler bed modes.
- The extra length gives a growing toddler room to stretch out before moving to a single.
A snug, gap-free fit in the cot bed frame matters most; cot bed sheets fit both stages.
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Emma Original Mattress
Hybrid, Medium Firm, 25cm, 200-night trial
Size: King size
Mattress Next Day
£599
£423
Mattress Online
£599
£453
Mattress Man
£559
+ 1 more retailer
Currently out of stock at all retailers
£216 cheaper than Emma direct
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Why this size?
- Cot beds convert to toddler beds, so the mattress is typically used until around age four.
- It's 10cm wider and 20cm longer than the standard cot size.
- The same mattress serves both cot and toddler bed modes.
- The extra length gives a growing toddler room to stretch out before moving to a single.
A snug, gap-free fit in the cot bed frame matters most; cot bed sheets fit both stages.
What size is a cot bed mattress?
70 x 140cm, fitting most UK convertible cot beds. Check your model's stated size, as a snug, gap-free fit is essential.
Should I choose a cot or a cot bed?
A cot bed is larger and converts to a toddler bed, so it lasts longer. A standard cot suits smaller nurseries.
What should a cot bed mattress be like?
It should be firm and flat, fitted to the frame with no gaps, in line with Lullaby Trust safe sleep guidance. A waterproof layer you can wipe clean helps too.