When a four-year-old baby has abdominal pain with vomiting, it needs to be further analyzed in conjunction with other specific conditions: 1. If the child has abdominal pain followed by fever, he or she needs to be alert to the presence of appendicitis. At this time, the child should be checked for routine blood tests to observe whether there is any infection in the blood picture, and then ultrasound should be performed to observe whether there is the possibility of appendicitis in the abdomen. If the child is diagnosed with an acute abdomen, such as appendicitis, he or she should communicate with the surgeon at this time and may undergo surgery or further conservative treatment. 2. If the child has a fever followed by abdominal pain, he or she needs to be alert to the presence of extraintestinal infections, such as pneumonia, mesenteric lymphadenitis caused by upper respiratory tract infection, and intestinal cramps caused by fever alone. If the child has mesenteric lymphadenitis, he or she should be treated with targeted antispasmodic and anti-infective treatment. 3. If the child does not have a fever, but has abdominal pain and vomiting, he or she needs to know his or her diet and whether there is a history of unclean diet or acute gastritis. In addition, it is also necessary to be alert to the presence of intussusception and intestinal obstruction in the child. If the child has intussusception, the child should be sent to surgery urgently; if the child has abdominal pain caused by unresolved stool, it may be sufficient to pass the stool. Children with acute gastritis should be promptly treated with antispasmodic and antiemetic therapy, and dietary guidance and treatment should be provided for symptomatic management.