The rate of fetal arrest at each week of pregnancy is not clinically specified, but it is relatively high in the early stages of pregnancy. Fetal arrest mostly refers to the phenomenon that the embryo develops to a stage where it dies and stops continuing to develop, and it is usually more likely to occur around 8 to 10 weeks of pregnancy, that is, early pregnancy. As the duration of pregnancy increases, the development of the fetus becomes more stable and the probability of fetal arrest decreases. There are many causes of fetal arrest, such as age, environmental factors, chromosomes, etc., and there is no way to completely prevent fetal arrest. Therefore, there is a possibility that fetal arrest may occur at all gestational weeks during pregnancy, but there is no specific numerical value for the exact rate of fetal arrest. Try to do a good job of prenatal checkups during pregnancy as well as monitoring during pregnancy to reduce the probability of embryonic arrest.