Congenital heart disease in children is one of the most common birth defects, accounting for about 30% of all birth defects. In other words, if ten children are born with congenital problems, three of them will have congenital heart disease. Congenital heart disease is mainly due to anatomical abnormalities in the fetus because the heart and large blood vessels do not develop to their normal position during development, or do not form normal structures and functions. Or some passages that should be closed, such as the ductus arteriosus, which should be present during fetal life and should close on its own after birth, but it does not close on its own. These are called congenital heart diseases, such as patent ductus arteriosus (PDA), pulmonary artery stenosis, atrial septal defect, ventricular septal defect, aortic stenosis, ruptured aortic sinus aneurysm, and tetralogy of Fallot. Why do these congenital heart diseases occur? This is a question of great concern and one that the medical community has been working tirelessly to investigate. There are many factors that may not be very clear so far, however, there are several major factors that are relatively certain at present. This is by far the most important and controllable factor. In other words, was the mother disturbed by the outside world during her pregnancy? As we know, the fetus develops from a fertilized egg, the father gives half and the mother gives half, from this fertilized egg develops into a whole individual. Countless cells come from this fertilized egg, so in the process of development, although it divides and reproduces according to the sequence of genes, this process is also prone to errors, and the most common cause of such errors is external interference. This external interference causes a lot of, like the common, the first is the virus infection, is the mother in pregnancy, infected with rubella, herpes virus, or even the common cold, the virus slowly from the blood into the fetal side will also affect the fetal development, especially in the cardiovascular development time period. The second is radiation. Radiation is everywhere, cell phones, microwave ovens and other commonly used appliances are radiation, the radiation damage is still relatively large, especially when the fetus is more sensitive to radiation development, so when you go to the hospital for examination, you will see our radiology room will have a small sign, which says that if you are pregnant, you must tell the medical staff, is absolutely not allowed to contact radiation. There is another factor, which is a living environment of the mother. We have a kind of experience, epidemiological survey also found that the highland area patients with precocious heart disease, the incidence is higher. This and the natural environment in which he lives, the geographical altitude, there may be relevant factors. Of course, the nutritional status of the mother itself is also influenced. Second, premature birth children are generally in 38 weeks to 40 weeks fetus will be born. If the baby is born too early, there will be a risk of congenital heart disease. The first and most common is the failure to close the ductus arteriosus. That said, it is a success and a failure. Why? Because when the fetus is in the mother’s womb, the lungs are not working and it depends entirely on the mother to bring in oxygen and nutrients. So when the lungs do not work, the body circulation and pulmonary circulation must have an exchange, this exchange is the throat is the main channel, is this arterial duct. It is clear that this arterial duct is the way of life that keeps us alive during the fetal period. But after birth, when we are separated from the mother, this way of life becomes a flood that endangers our lives. The first cry of a baby is a sign of its independence. When he cries, his lungs open up and work on their own, and this major traffic path is no longer needed, it needs to close on its own. Once it does not close, a continuous ductus arteriosus forms, and then a lot of blood runs from the left to the right. Especially in premature babies, because the development has not reached this time will be more likely to appear this situation. Third, genetics Genetics from the current level of research can detect some diseases through genetic screening. For example, trisomy 21 can be manifested in the heart as endocardial cushion defects, which can be screened by means of prenatal examinations. However, it is important to remind parents that these means are currently limited, and there are still a considerable number of diseases that are not detected by the current means of detection. In addition, advanced maternal age is also a factor in fetal precocious heart disease. The congenital heart disease it has many controllable and uncontrollable factors. But no matter what, we based on the current level of technology, to control the controllable factors as much as possible. Start with every little thing around you. I hope everyone can have a healthy and active baby.