The severity of perinatal cardiomyopathy may be asymptomatic in mild cases or life-threatening in severe cases. Perinatal cardiomyopathy may be mildly shortness of breath and dyspnea, which is not very serious in mild cases. However, if nocturnal paroxysmal dyspnea or even telangiectatic breathing occurs, the symptoms will be more severe, and a large number of wet rales can be heard in both lungs on examination; in severe cases, cardiogenic shock can occur. In other words, if the perinatal cardiomyopathy is in cardiac function class I or II, it is not serious, and oral medication and careful care can be taken. If it is in cardiac function class III, it needs active treatment, and if the treatment is timely, the prognosis is still good. If it is in cardiac function class IV, the condition is quite serious and may be life-threatening at any time.