Hello
Crampy
abdominal pain with little stool may be due to
constipation,colitis or any local cause like fissure,
hemorrhoid etc.
I would suggest you to give him some laxatives,plenty of fluids and diet containing high fibers in view of constipation.
Also give him antibiotic like ofloxacin and
metronidazole as colitis commonly presents with these symptoms.
Regards