According to the Centers for Disease Control and Prevention, the average weight for an 11-year-old child is between 60 and 120 pounds. In addition to weight, doctors often determine children's body mass index.
The body mass index is based on the child's height and determines if the child is at a healthy weight, or is overweight or underweight. According to WebMD, children who are overweight are more likely to be overweight as adults. Overweight children are also more likely to develop high blood pressure, diabetes and high cholesterol. A healthy diet and regular exercise are two ways to manage children's weight.