This question is actually not easy to answer, because there are many factors that cause or may cause the occurrence of congenital heart disease, we can only try to avoid the currently known predisposing factors, so that we can achieve the purpose of eugenics. The first trimester of pregnancy is an important stage in the formation of the fetal cardiovascular system. After pregnancy, you should avoid infections, alcohol consumption, smoking, intimidation, radiation exposure, and the use of potentially teratogenic drugs, keep your mood relaxed, do not be overjoyed, sad, mood swings, live a regular life, adequate nutrition, no partiality, no excessive exertion, no stimulation, and it is important to maintain a peaceful and tranquil state of mind.