What should I do if a child has a stomachache (pain around the navel)?

Patient's question:

Age
Detailed medical history and consultation purpose: Frequent abdominal pain (pain around the navel), poor appetite, and shorter height than peers of the same age. Even after taking deworming pills, no worms were found. Now, whenever returning from kindergarten to home, abdominal pain usually occurs, and it subsides after applying a hot water bag. Please ask the doctor what causes the persistent abdominal pain and why the appetite is poor.
Medical history: In the past, abdominal pain was seen by a doctor, who diagnosed it as: intestinal spasm

Doctor's answer:

Hello
Some children often experience this, colic. Infantile colic, also known as intestinal spasms, is a paroxysmal or intermittent abdominal pain caused by strong contractions of the intestinal smooth muscles. It is a common pediatric disease and the most frequent cause of acute abdominal pain in children. Its characteristics include sudden onset of abdominal pain, primarily around the umbilicus, with no abnormal signs during intervals of. It is most common in infants under 3-4 months old.
(Etiology and Pathogenesis)
The exact cause is still unclear, but it may be related to incomplete maturation of the central nervous system and physical constitution, or it may be triggered by factors such as improper feeding, overeating, excessive cold food, food allergies, and indigestion. It often occurs due to parasympathetic nerve excitement, leading to temporary intestinal spasms that temporarily block the passage of intestinal contents, causing strong peristalsis in the proximal intestine and resulting in colic.