Squatting phenomenon refers to a special forced position, mainly due to congenital tetralogy of Fallot children, he is walking, or in the time of sitting will appear to bend the legs with the fraud section of the special position, and then will return to normal walking this situation will repeatedly occur, the tetralogy of Fallot, also known as cyanosis tetralogy of Fallot, is a joint congenital cardiovascular malformation, the disease is the most common cyanotic congenital heart vascular disease. The appearance of squatting phenomenon is the result of a combination of factors. To prevent the occurrence of squatting phenomenon, the publicity and education of scientific knowledge should be carried out, key monitoring should be carried out for the age group, and the role of medical personnel and pregnant women and their family members should be given full play, so how to prevent the appearance of squatting phenomenon? The following is to give you a general introduction. The squatting phenomenon of prevention methods 1, the couple should make adequate pre-conception preparations, especially to quit smoking and alcohol and other bad habits. 2, before pregnancy to actively treat diseases that affect the development of the fetus, such as diabetes, lupus erythematosus, anemia, etc. 3.Actively do prenatal checkups, prevent colds and flu, avoid using drugs that have been proven to have teratogenic effects, and try to avoid contact or use of drugs and harmful substances that are prone to teratogenic effects and the environment after pregnancy. 4.The monitoring should be focused on those who are of advanced maternal age, have family history of precocious heart disease, or one of the spouses has serious diseases or defects.