Thank you for your query,
With the description of the child symptoms of pain abdomen, it is looking like recurrent pain abdomen of childhood.
A routine complete blood picture, sedimentation rate, stool tests for parasites especially giardia and urine analysis can be done as a screening study.
Consult your Pediatrician
for the detailed history of symptoms and a thorough physical examination and basic screening investigations and ultrasound
abdomen, if this evaluation is normal nothing to worry as there will be no major underlying problem.
Be in regular follow up with the Pediatrician to detect any underlying organic cause.
Hope i have answered your query.