Compulsivesquatting refers to a squatting position or knee-to-chest position to relieve symptoms due to difficulty breathing and palpitations during short distance walking or other activities. It is seen in cyanotic congenital heart disease. The following is a detailed description of the etiology of the disease. It is generally believed that early pregnancy (5-8 weeks) is the most important period for fetal heart development. There are many reasons for the development of congenital heart disease, genetic factors only account for about 8%, while the majority of 92% are caused by environmental factors, such as women taking drugs during pregnancy, infection with viruses, environmental pollution, radiation, etc. can cause abnormal fetal heart development. In particular, rubella virus infection in the first trimester of pregnancy can sharply increase the risk of congenital heart disease in the child. Cyanosis is a manifestation of cyanotic changes in the skin and mucous membranes due to increased deoxygenated hemoglobin in the blood, which may also be called cyanosis. This change often occurs in areas with thinner, less pigmented skin and richer capillaries, such as the lips, fingers (toes), and nail beds. Due to the presence of malformation, the pressure in the right atrium exceeds that in the left atrium, resulting in a shunt of blood from the right to the left and a persistent cyanosis, called cyanosis.