The body of the pregnant fetus dies with noticeable changes, such as the disappearance of pregnancy reactions, no more nausea, vomiting, and loss of appetite. There is also a noticeable relief of breast swelling and pain, as well as abdominal pain and vaginal bleeding. However, some pregnant women have no obvious symptoms even after fetal death, so it is important to have regular maternity checkups during pregnancy so that abnormal fetal development can be detected and dealt with in time, and the health of the pregnant woman can be safeguarded. There are many causes of fetal death during pregnancy, such as fetal chromosomal abnormalities and major malformations leading to fetal death. Fetal death is also likely to occur when the placenta and umbilical cord are diseased, as the fetus cannot develop smoothly due to the poor blood and oxygen supply to the placenta and umbilical cord. Fetal death is also likely to occur when the pregnant woman has gestational diabetes and hypertension. In order to protect the eugenics, it is better to have a physical examination before preparing for pregnancy to avoid abnormal fetal development after conception.