Umbilical cord from and contains remnants of the yolk sac and allantois. It forms by the fifth week of development, replacing the yolk sac as the source of nutrients for the embryo. The cord is not directly connected to the mother's circulatory system, but instead joins the placenta, which transfers materials to and from the maternal blood without allowing direct mixing. The length of the umbilical cord is approximately equal to the crown-rump length of the fetus throughout pregnancy. The umbilical cord in a full term neonate is usually about 50 centimeters (20 in) long and about 2 centimeters (0.75 in) in
Uterus transplantation organ transplant operation, including infection and organ rejection. Some ethics specialists regard the risks to a live donor, as opposed to a post-mortem donor, as being too great, and some find the entire procedure ethically questionable, especially since the transplant is not a life-saving procedure. In November 2017, the first baby was born after a uterus transplantation in the US. The birth occurred at Baylor University Medical Center in Dallas, TX, after a uterus donation from a non-directed living donor . India's first uterine transplant baby, weighing 1.45 kg, was delivered through a Caesarean section at Galaxy Care Hospital in