If an embryonic arrest is discovered, there are many specific reasons for the arrest. Firstly, the main reason for embryonic arrest is due to congenital abnormalities in the formation and development of the fertilized egg, which is a relatively common situation. Moreover, embryonic arrest usually occurs early when there are developmental abnormalities. In some cases, it may be caused by maternal factors, such as abnormal diseases in the mother or abnormalities in chromosomes, which can lead to poor embryonic development and subsequently cause embryonic arrest. Occasionally, issues related to the viability of the male sperm, or the presence of abnormal sperm, may also lead to embryonic arrest. Because there are many reasons for embryonic arrest, it is generally not possible to systematically investigate the specific causes.