There is no doubt that this one is overweight. There are many formulas to calculate the standard weight. The common ones are: height (cm)-105= weight (kg), your son's standard weight should be170-100 = 70kg (140kg), and the child's weight. The solution is to eat less and exercise more. Parents should not always say: it's time for you to lose weight when they see their children getting fat! But when the child eats, he is always asked to eat more for fear that he will be hungry. Then there is the demand for consumption, which consumes the calories you eat and consumes calories by increasing the amount of exercise. Parents must urge them to persevere, persevere and even exercise with their children.