What are the causes of fetal arrest?

Embryo arrest refers to the natural termination of early embryo development and embryo loss. There are many reasons for embryo arrest, most of which are caused by abnormal embryo chromosomes, followed by endocrine factors, infection factors, immune factors, environmental factors, abnormal placenta implantation, abnormal villous vascular development, abnormal male semen and advanced age of pregnant women. In addition, there are still most embryo arrest reasons unknown.