Pneumonia is a particularly common infectious disease of the respiratory system, and infants and young children are especially susceptible to pneumonia because their immune systems are much weaker than those of healthy adults. When infants and young children develop pneumonia, their symptoms differ from adults; they often exhibit only fever, crying, nausea, vomiting, etc. The symptoms of coughing and phlegm are relatively less obvious, making the diagnosis of pneumonia in infants and young children somewhat more difficult. If a patient exhibits fever, auscultation and routine blood tests can be used to preliminarily determine the presence of an infection. If pneumonia is suspected, further comprehensive imaging examinations can be conducted to confirm the diagnosis.