The fetal umbilical cord serves to transport nutrients and waste products and is usually formed 3 to 4 weeks after fertilization. Sperm combines with an egg to form a fertilized egg. After the fertilized egg is deposited, fetal buds and a fetal heart will appear, and the umbilical cord will grow with the formation of the placenta, a process that takes about 4 weeks to go through. This process takes about 4 weeks. The umbilical cord is attached to the placenta on one side and to the fetus on the other side, providing nutrients for the growth and development of the fetus. The umbilical cord is a cord-like structure with two umbilical arteries and one umbilical vein, which allows for the exchange of blood gases and nutrients. The umbilical cord is very important to the development of the fetus, and it can be examined during pregnancy to see how the fetus is developing. If you find that the umbilical cord has not formed within the above mentioned time, it is recommended that you consult a doctor in time and complete the relevant examinations under the doctor’s guidance to clarify the cause of the disease and treat the symptoms.