Hi, Welcome to Healthcare Magic Forum.
Your son may be suffering from Gastroenteritis
since he is pointing the pain to be around navel. Is your kid in the habit of eating soaps or mud (Geophagia). Get him examined by a Pediatrician
, so that he can rule out any underlying pathology. He may need a Ultrasound
scan or Abdominal X ray.
Good Luck and Take Care.