Sizes on Taobao and Weidian might work a little different from what you're used to, depending on where you are from.
First of all, sizes will run different from item to item and seller to seller, the best way is to read the size chart, make sense of it, and measure yourself. You can also find out how the size runs from previous buyers.
Are you looking at the size for clothes or shoes?
added: 6/26/2023