pediatrician, neurologist
Hello! If the food you have in order, then the case in the body of your child. You need to examine the gastrointestinal tract: FGS, sigmoidoscopy, ultrasound of the abdominal organs, radiography of the abdominal cavity.
Also, such a condition can be due to a violation of the metabolism of enzymes; blood can be donated to the level of liver enzymes and pancreatic amylase.
And be sure to go for a consultation with a pediatric surgeon and a gastroenterologist.