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Umbilical Cord

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Like a deep-sea explorer inside a diving bell, unborn babies rely on a lifeline to the outside world. The umbilical cord connects a baby to its mother's placenta, facilitating a life-giving exchange. Two arteries remove waste and one vein brings in nutrients and oxygen-rich blood.

The cord forms from the same sperm and egg that form the placenta and fetus, usually appearing by the fifth week of fetal development. It replaces the yolk sac and reaches a length of roughly 20 inches. By the seventh week, it is clearly visible on ultrasound.

Cutting the Cord


You will deliver the placenta and umbilical cord soon after the baby, usually within 30 minutes of birth. The cord normally collapses on its own and has a natural clamping mechanism, but healthcare providers now clamp it manually within a few minutes of birth.

Some fathers are allowed to cut the umbilical cord themselves, which can be a powerful experience that helps them feel a part of the birth. Nervous dads needn't worry: The cord is made up of something called Wharton's jelly and has no nerves, so cutting it is not painful for the mother or baby.

The remaining stub takes about two to three weeks to dry up and fall off. It leaves a small scab that may take a few days to heal.

Complications


Several umbilical cord complications can arise during pregnancy, ranging from false knots, kinks in the umbilical cord vessels that are harmless, to vasa previa, which often is fatal to the unborn baby.

In vasa previa, which strikes about one in 2000 to one in 5000 pregnancies, the fetal blood vessels cross the cervical opening. These vessels typically tear when the mother's water breaks and the baby hemorrhages.

Vasa previa can often be detected by ultrasound before birth. This information can help your doctor provide a safe delivery.

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