The main symptoms of neonatal severe pneumonia are: 1. Respiratory symptoms, manifested as changes in respiratory rhythm, such as increased respiration, the newborn may breathe more than 60 times/minute, with moaning, shortness of breath or foaming. If the late neonate has a cough; if the respiratory syncytial virus infection in autumn and winter, there is also the phenomenon of wheezing; for severe pneumonia, there is poor blood oxygenation, cyanosis or skin bruising; severe pneumonia in the terminal stage may also appear changes in pulmonary hemorrhage; 2, respiratory symptoms suggest that there may be neurological changes, mainly manifested as coma, convulsions or consciousness The cardiovascular system may have changes, such as increased heart rate, arrhythmia, or heart failure; 4. Complication of continuous fetal circulation, which leads to increased difficulty in rescue and treatment.