What causes pregnancy and stillbirth?

There are many reasons for stillbirth in pregnancy, such as placenta praevia, placental abruption, vascular previa, acute chorioamnionitis, umbilical sail-like attachment, umbilical knot, umbilical cord prolapse, umbilical cord around neck, or a large amount of placental bleeding, resulting in fetal hypoxia, all of which may show fetal death in utero, and if the fetus has serious abnormalities, fetal growth restriction, twin transfusion syndrome, fetal infection, serious genetic diseases, maternal and fetal blood group incompatibility, These conditions can also cause stillbirth. If the pregnant woman has severe gestational hypertension, antiphospholipid syndrome, diabetes, cardiovascular disease, shock caused by various causes, or ischemia caused by uterine malformation or uterine rupture, it may affect the fetus and cause death.