Thank you for your query on Healthcare Magic.
In addition to pain, are there any other symptoms like vomitings or constipation?
Any history of excessive weight gain?
The protruded belly may be due to a part obesity or disorders like hypothyroidism
has to be ruled out by doing blood investigations.
Physical examination by a Pediatrician is needed to locate the area of pain in the abdomen and to investigate for her problems.
Therefore consult a Pediatrician
Hope I have answered your query.