I would say a twin, or something around that size. Unless you have a 6 foot tall 5 year old, they're not going to need that big of a mattress.
No it cant.
no
8
no not really
5.1 Inches
Yes.
macys and tristans ears
well it really depends on the size of the 5 year old
Walmart
Normally 10 year old girls are a size 5, but size 4 is normal too
you can get a bra measure from primark
36 A, but it depends on the person