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The normal umbilical cord has two arteries and one vein, that being said

Absence of one of the umbilical arteries can happen -how often you may ask-,

not that often roughly in 0.5-5% of neonates (depending on the filters applied)

But we can use 1% as a mnemonic value.

In 10-27% of cases the fetus can have other malformations (frequently intestinal atresia/stenosis, renal agenesis, and heart defects, but of course many other can occur) It is said that it was first described by Vesalius (1514-1564) (can you imagine?)

It can be detected prenatally by ultrasound, but if not detected prenatally, it should be noted at birth.