Sail-like placenta does have some potential risk to the fetus. The normal placenta is not sail-shaped, because the umbilical cord of the placenta is attached to the fetal membranes, so it is called sail-shaped placenta, just like the sail of a sailboat. A sail-shaped placenta may be complicated by an anterior vessel, which may compress the vessel in late pregnancy, causing fetal distress and predisposing the fetus to water breakage. The rupture of the anterior vessels can lead to acute hypoxia of the fetus and even fetal death in the womb. If the placenta is found, it is recommended to do an ultrasound to see if there are any anterior vessels. If the anterior vessels are found, as the weeks increase, the fetal head may descend and compress the anterior vessels, leading to fetal hypoxia, or even premature rupture of the fetal membranes tearing the anterior vessels, leading to fetal hemorrhage and intrauterine death. Therefore, it is generally recommended to terminate the pregnancy by hospitalized cesarean section when the anterior vessels are around 34 weeks.