Severe pneumonia in infants is manifested by severe symptoms of toxicity, shortness of breath, irritability, cyanosis of the lips and mouth, cyanosis of the terminal extremities, fever, cough, chest pain, some manifesting as the trigeminal sign, dyspnea, accelerated heart rate, some accompanied by confusion, pallor, multiple organ damage can occur, and severe cases can cause kidney failure and even life threatening. In such cases, it is necessary to intensify treatment, administer oxygen, reduce fever, and keep warm. Apply appropriate antimicrobial therapy under the guidance of a doctor.