If the fever
still persists and he has started vomiting
it is better you take him to a doctor. If the fever has subsided, he looks well and vomiting is not frequent you may wait for some time. Give him bland diet-avoid oily and spicy food. Vomited material may be yellow. If you noticed brown or red specks after several bouts of vomiting it may be blood. Repeated vomiting may cause some damage to the lining of stomach and cause minor bleed. It will stop once vomiting is controlled. If he has severe abdominal pain
he should be seen by a doctor asap.