There is no ideal or perfect weight for a 10-year-old (or a person of any age). This is because weight is related to height and body composition rather than age.
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* A ten year old girl should weigh between 50-85 pounds. * For a 10-year-old girl there is no 'average' weight because 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
The average weight for a 10 year old is about 30Kgs. But there are wide variations.
There is a wide variety of a healthy weight for a 10 year old girl. Really it can be anywhere from about 55 to 100 pounds depending on their height and how much muscle they have.