What is a normal weight for a 16 year old boy?
Weight is worked out on height not age.
You weigh 5 stone 8 ozs you are a 10 year old boy is this underweight and your height is 4 ft 6 inches?
There is no "normal" or ideal weight for a 12-year-old boy or girl. Weight is related to height and body composition rather than age. For in-depth information about weight in relation to height, and to see the distribution of weights and heights of children at various stages, please see the page link, further down this page, listed under Related Questions.