The average weight of a 10-year-old girl is 70.5 pounds. The average height for a 10-year-old girl is 54.5 inches. The average weight and height for a 10-year-old boy is the same as the average height and weight of a 10-year-old girl.
Young children gain and lose weight rapidly due to frequent growth spurts. Dieting for young children and teens is not recommended because children grow out of their baby fat as they mature. A parent concerned about the weight of a child should consult that child's physician to help determine if a child is overweight or underweight for her age and height.