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umbilical artery, single
Ordinarily, the umbilical cord contains three vessels: two arteries and one vein. Since the fetus can function perfectly well with only one umbilical artery to handle blood flow to the placenta, this poses no problem. However, this anomaly is also sometimes associated with other more significant physical abnormalities in the baby, and thus can cause some concern and prompt your pediatrician to perhaps consider some studies to check out possible problems.
In a recent large study,
The condition is more common among twins.
Personal note: one of my sons had a single umbilical artery, and is just fine.