Can you buy a slightly smaller single mattress which is normal width?

[CliffordTheBigBlueDog]

Would like to reduce the length of the bed in my daughter's box room which I can easily do but can't find a shorter mattress which is 90 cm wide.
I could cut a bit off the mattress but would rather not have to do that.
TIA

Have a look at IKEA. They do toddler beds (and therefore mattresses) that you can set to different lengths. They might have something you could use

Your choices would be single or small single. The small single is narrower as well as shorter.

You can have a mattress made any size. Just google customised size mattress.

Argos used to do shorty bunks so might have short mattresses

The shorty beds seem to be the same size as the small single. Or yes, get a mattress made to the size you want

Have a look at eFoam.co.uk.
They will do a foam mattress with a memory foam top in any measurements. If it comes to over 100 you get free delivery too.

As PP said I'd try Ikea. DD used to have an extendable bed from there with shorter than usual mattress.