The total stoppage after the third trimester of pregnancy is considered to be fetal arrest, which may be due to embryonic factors, maternal factors, paternal factors, environmental factors, and so on. 1. Embryonic factors: If the embryo has chromosomal abnormalities, such as trisomy 13, 6, 18, 21 or 22, it is easy to have fetal arrest. 2. Maternal factors: If the mother has infections, such as toxoplasmosis, rubella virus, cytomegalovirus, herpes simplex virus, etc., it is easy to have embryonic arrest; if the mother has autoimmune problems or Rh-negative blood type, etc., it is also easy to have fetal arrest; and if there are chronic diseases, such as diabetes mellitus, hypertension, nephritis, etc., it will also cause fetal arrest. 3. Paternal factors: Paternal factors are mainly poor sperm quality, which can easily cause fetal arrest. 4. Environmental factors: If you are exposed to some heavy metals, X-rays or in a polluted environment for a long time, it is also easy to cause fetal arrest. After the third trimester of pregnancy, you should go to the hospital to find out the cause of the standardized treatment, and then get pregnant after the disease is cured.