What is the right weight for an eight year old girl?

There is no ideal weight for an 8-year-old girl (or a child of any age). 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 ages, please see the page link, further down this page, listed under Related Questions. Alternatively, please feel free to ask the question again and include more detail.