Umbilical cord cyst is a cyst in the umbilical cord area of the fetus. If a 5cm cyst occurs in early pregnancy, it is generally not serious, but if a 5cm cyst occurs in the middle or late pregnancy, it needs attention. 1. Early pregnancy: Umbilical cord cysts are cysts that occur in the umbilical cord, originating from the umbilical ureter and the remnants of the vitelline duct. 5cm cysts in early pregnancy are most likely a normal phenomenon, and will disappear after some time. 2. Mid-pregnancy, late pregnancy: 5cm cysts in mid-pregnancy or late pregnancy may compress the umbilical cord blood vessels. If the compression is severe, it may affect the blood supply of the fetus, causing fetal distress or even death, which is relatively serious. If an umbilical cord cyst of 5cm occurs during pregnancy, it is recommended to go to the hospital immediately for examination, observation of the cyst, and standardized treatment under the guidance of the doctor.