If the umbilical cord is attached to the upper edge of the placenta, it is called a racket placenta, mainly because the umbilical cord and placenta form a badminton racket structure. If there is a certain distance between the umbilical cord and the upper edge of the placenta, and the vessels of the umbilical cord are exposed on the fetal membranes, this condition is called sail-like placenta, just like a “sail”. The impact on the fetus is mainly due to the possibility of fetal growth restriction, but the incidence is relatively low. It is recommended to have regular maternity checkups. If the maternity checkup is normal and the fetal indicators are not abnormal, it will not have much effect. There is a more dangerous condition in sail placenta, that is, rupture of sail placenta anterior vessels, which may cause fetal hypoxia and even fetal death. The rupture of the anterior vessel means that the exposed vessel is located right at the end of the cervix, when the water breaks, the exposed vessel will rupture at the same time, and since the blood flowing in the anterior vessel is the fetal blood, it can cause fetal ischemia and hypoxia in a short time, which requires timely treatment. In addition, it is extremely rare that the umbilical cord pulls too strongly due to fetal activity, causing the exposed vessels to pull and bleed. However, the insertion point of the umbilical cord in anterior vessels is usually located at the lower edge of the placenta. If the insertion point of the umbilical cord is located at the upper edge of the placenta and not at the lower edge of the placenta, and the exposed vessels are not near the inner cervical opening, the effect is usually not significant. It is important to do regular obstetric examinations during pregnancy to observe the position of the umbilical cord and the placenta as well as the fetal movement. Normally, the umbilical cord is located in the center of the placenta, just like a “lotus leaf”. If ultrasound examination reveals that the umbilical cord is at the upper edge of the placenta, it is a variation of the position of the umbilical cord and the placenta and there is no fetal malformation.