In general, persistent right umbilical vein is normalized after delivery of the fetus and does not affect the growth and development of the fetus. It is known that the right and left umbilical veins are formed when the fetus is first formed, and are directly connected to the venous sinus. As the fetus develops, the right umbilical vein gradually degenerates while the left umbilical vein continues to develop. Persistent right umbilical vein is an anatomical variation in which the right umbilical vein, which should have degenerated, does not degenerate, while the left umbilical vein, which should not have degenerated, does degenerate. Generally speaking, this phenomenon will not affect the growth and development of the fetus, and the fetus will basically return to normal after birth, so there is no need to worry. However, if the fetus also has some other malformations, then we need to pay attention to it, which may cause harm to the growth and development of the fetus, and it is unlikely that the fetus will return to normal even after delivery. Therefore, parents are advised to go to the hospital as soon as possible for chromosome examination, and if the fetus has abnormalities, then it is necessary to terminate the pregnancy in time under the guidance of the doctor.