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Abnormal number of vessels. 2-vessels cords. Single umbilical artery (SUA), the most common anatomical abnormality of the umbilical cord, is found in 0,2-1,1% of singleton pregnancies1, and in 6-11% of multiple pregnancies. The selection process of the missing (or existing) vessel is likely to be random, even though a right single artery is slightly more common2.
3 doctors agreed: 1  Doubtful: Many infants are born with a single umbilical artery and have an uncomplicated life. For some, it is just one of many abnormalities that are part of a complex pattern or syndrome, and could be part of a chromosome defect.