Good evening, could you please tell me about a child's problem with bo…

Good evening, could you please tell me about a child's problem with bowel movements (constipation) since birth and also that they practically don't eat any vegetables. We went on vacation for two months to another region in the countryside. When we returned, the child's stool became liquid with blood streaks (teeth? climate? environment?). The child started being afraid of going alone constantly asking for hands... An appointment with a gastroenterologist is scheduled tomorrow. Head all the time...