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When Does Umbilical Cord Fall Off? After your baby is born, the umbilical stump usually dries up and falls off when your baby is about two weeks old. Two weeks isnât an exact number, some babies lose their stump as early as 7 days and as late as 21 days.
The umbilical cord develops from and contains remnants of the yolk sac and allantois (and is therefore derived from the zygote). It forms by the fifth week of fetal development, replacing the yolk sac as the source of nutrients for the fetus.