As a baby I was born with a pituitary issue which meant my hands and feet were abnormally small. They never grew that large at all. I can run and walk fine and they’re not deformed or anything, just tiny. I might have some hilarious world record for smallest hands and feet on a fully grown adult! Luckily my condition hasn’t affected any other part of my body.
I found this chart, but that may just be for the US division of Nike.
Apparently, each full size is equivalent to 6/16 of an inch, or 0.9 cm.
Appreciated, thanks