What is the ideal body weight for a 9-year-old girl?

There is no ideal body weight for a 9-year-old girl. Weight is related to height and body composition rather than age. Please feel free to ask the question again and include more detail. Alternatively, for more 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.