Sorry not aibu but I need a quick answer. I'm ordering a t-shirt my dd wants as one of her bday gifts, but the website states the sizes in kids small, kids medium, kids large instead of by age. They don't provide any measurements either. What size would an average 10 year old be? I've always brought her clothes in age not size, so rather confused. I think it's from an American brand but sold from UK if that makes any difference. Thanks