Yeo thats the other part of the story. If you are good looking kid teachers, especially female ones, will be over-positive about your tasks and work, it will make you think you are good at something, and if you are good at something and people react positively to that you want to do it more and your brains develop.
And then theres ugly little kid, whose work is on the same level, but hey he is ugly so teachers, especially females ones, will treat him in a less posivtive manner if positive at all, maybe even neutral like ugly kids brings good job? Yea its expected from him. So little kiddo wont hear how good he is, and how awesome his work is so he wont build any confidence of positive reinforcement.