Net weight depends on acivity (calorie input_ caloried used.)  Weight loss is either due to poor feedings or due infections or due to increased activity. So solve you r problem . Weight loss is due to ailment where metabolism gets disturbed. Relax. Don' t keep worrying. Take care of mosquito to protect against malaria and dengue. Don't forget immunization. Respect your child's presence. Never shout or argue or abuse in the presence of your child.they cause behavior problems.