The absence of fetal heartbeat in both pregnancies, this situation is generally considered that the pregnant woman may suffer from some diseases that affect the normal development of the fetus, or due to the presence of some chromosomal abnormalities in the pregnant woman or her husband, which affects the normal development of the embryo. The most common causes are: 1. chromosomal abnormalities are the most common causes of embryonic arrest in early pregnancy, and the absence of fetal heartbeat. 2. uterine malformations, if the pregnant woman has an abnormal uterus, an infantile uterus or a longitudinal uterus, which affects the normal development of the embryo, can also cause early embryonic arrest. 3. uterine diseases, pregnant women suffer from uterine fibroids, endometriosis, endometrial tuberculosis, thin endometrium The embryo will not develop normally after the fertilized egg is laid, and embryonic abortion will occur in early pregnancy. 4. poor ovarian function and insufficient progesterone level will affect the normal development of the embryo.