The umbilical cord is attached to the edge of the placenta, which is related to the sail placenta, racket placenta and anterior vascularity. 1. sail placenta: the umbilical cord is first shaped on the fetal membranes and then attached to the edge of the placenta, at this time there is no protection around the umbilical cord root with warton glue, which is easily compressed by the fetal head or fetal limbs, resulting in poor blood flow to the umbilical cord root and causing fetal hypoxia. This is a dangerous condition and requires close monitoring of the fetal heartbeat and fetal movement and regular monitoring of the fetal heartbeat to observe the intrauterine condition of the fetus. In addition, the condition of the fetus needs to be determined according to the condition of the fetus to determine whether it is eligible for natural delivery. 2. racket placenta: the umbilical cord is inserted from the edge of the placenta, that is, attached to the edge of the placenta. If the umbilical cord is attached to the lower edge of the placenta near the cervical area, i.e. combined with low placental position, it may be compressed by the previa of the fetus, resulting in intrauterine distress or even death of the fetus. Therefore, in such cases, attention should be paid to monitoring fetal heartbeat and fetal movement, and if necessary, the delivery method of cesarean section can be chosen; 3. Anterior vascularity: refers to the blood vessels on the fetal membrane crossing the inner cervical opening. In this case, it causes the umbilical cord to attach to the edge of the placenta. At this time, if a rupture of the fetal membranes occurs, it may cause the rupture of the umbilical vessels of the anterior and cause bleeding. Since fetal blood is flowing in the umbilical vessels, if the anterior vessels rupture and bleed, it may cause fetal hemorrhagic shock, fetal distress, or even fetal death in utero and neonatal asphyxia. Therefore, it is necessary to closely monitor the fetal movement and heartbeat, and for the sake of fetal safety, hospitalization should be early around 34 weeks of pregnancy, and Caesarean section should be chosen as the delivery method.