The flu is a common disease with multiple origins, mostly caused by viruses, and some rubella, which has no rash manifestations, also resembles the flu. Epidemiological studies have found that among children with congenital heart disease, the proportion of their mothers who had respiratory infections in early pregnancy was significantly higher than that of those with non-precardiac disease. Although the relationship between cold and congenital heart disease in pregnant women has yet to be further researched and elucidated, studies have shown that during pregnancy, viral infection in pregnant women can also affect the fetal heart through the placenta, and it is now believed that heart disease in some babies is closely related to intrauterine infection in the fetus.