How much should a 7-year-old girl weigh?

* A seven year old should weigh aboutforty through fifty pounds. * There is no average weight for a 7-year-old girl (or a child of any age) 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 charts showing the distribution of weights and heights of children at various ages, please see the page link, further down this page, listed under Related Questions.