A child's constitution is related to heredity. If parents are not fat, children will not get fat easily, as long as they are healthy. The nutrition given to children at ordinary times must be balanced. The child's weight is dynamic, but it changes with growth. When children grow taller, they will gain weight. Children may look thinner before the rate of weight gain increases. Of course, it is also possible that the child's weight grows faster than his height, which eventually leads to overweight.