Vomiting in children should not be taken lightly as this can lead to dehydration. If this is occasional, it can be due to indigestion. Give him light food and ORS electrolyte solution. Take sips of the electrolyte solution. If the vomiting does not stop, show him to the pediatrician and the pediatrician can prescribe some anti-emetic drugs. Please continue to give sips of water to the child so that he is well hydrated..