Newmomsforum - Let's talk about babies who have two vessel cords, also known as SUA (Single Umbilical Artery). Typically, an umbilical cord has two arteries and one vein (left side pic).
Graduated!! 38 weeks. Two vessel cord. (Mostly) Positive induction story in comments. : r/BabyBumps
Color Doppler image correctly demonstrating a three-vessel umbilical... | Download Scientific Diagram
Assessment of the number of umbilical cord vessels at the time of nuchal translucency screening - MedCrave online
Figure 2 from A Huge Umbilical Vein Aneurysm: Case Report and a Brief Review of Literatures Describing Umbilical Vessel Aneurysm | Semantic Scholar
A photograph of umbilical cord showing three vessels. | Download Scientific Diagram