Causes of congenital heart disease Heart development is completed within the first 3 months of fetal formation and is the earliest functional organ to be formed, which is a prerequisite to ensure the smooth development of other organs. Some babies are found to have congenital heart disease just after birth, some simple ones such as ventricular septal defect, atrial septal defect and patent ductus arteriosus can be easily cured by intervention or surgery, while some complex congenital heart diseases such as functional single ventricle, complex transposition of the great arteries and various complex congenital heart diseases are likely to cause the baby to die soon after birth, so what exactly What are the causes of congenital heart disease? There are many causes of congenital heart disease, but in general terms it may be related to the health and nutritional status of the mother during pregnancy. Viral infections of the mother during the first 3 months of pregnancy, such as rubella, mumps and influenza, may affect the development of the fetus’ heart and large blood vessels, resulting in congenital heart disease or a combination of other malformations. Endocrine diseases of the mother during pregnancy, exposure to radiation or other drugs and toxins may also cause cardiovascular malformations in the fetus. In addition, the environment of hypoxia in highland areas, family and genetic factors may also be the cause of occurrence. The specific underlying causes of malformations in pediatric heart development are still not very clear, but in summary, they are definitely related to the following factors: 1. The development of a certain part of the fetal heart stops at a lower stage, or due to an axial error in the process of development, such as transposition of large blood vessels. 2.After the birth of the child, a part of the special cardiovascular pathway needed during the fetal period still remains for a long time, such as arteriovenous catheterization. 3.The mother’s disease often affects the fetal development. If the mother is infected by virus during the first 3 months of pregnancy, especially rubella virus, the child is prone to heart malformation. 4, the mother took certain drugs during pregnancy, can also lead to fetal heart malformation. 5.Some genetic factors that can lead to congenital heart disease.