<prompt> The commonest cause of intestinal obstruction and abdominal pain in children between 3 months to 6 years of age:IntussusceptionMeckels diverticulumIntestinal polypNonspecific cause  <response>: Ans. A. IntussusceptionIntussusception occurs when a portion of the alimentary tract is telescoped into an adjacent segment. It is the most common cause of intestinal obstruction between 3 month and 6 yr. of age. 