Parents who force children to clean their plates undo the natural calorie-control system. Young children will not eat what they do not like. The harder you push, the more they may say no. Weight management should be secondary. Present your child with different healthy alternatives and allow the child to choose among them.
Children feel better when they can make choices.
Since feeling in control breeds confidence, their choices can lean to habits. Encourage your child to stop eating when satisfied. Do not be a food cop who strictly controls what and how much your child eats. This could lead to overeating when you are not around. Perhaps the most important thing you can do to get your child to eat well and be active is to set a good example.