What causes it? The condition is a congenital abnormality. This means it occurs during development as a fetus, and affected baby girls are born with the condition. We know that the condition occurs when two small tubes fail to merge into one and instead develop into a uterus each.

How common is uterus didelphys?

The condition is less common than these other uterine malformations: arcuate uterus, septate uterus, and bicornuate uterus. It has been estimated to occur in 1/3,000 women.

Is uterus didelphys hereditary?

Doctors aren't certain why some fetuses develop a double uterus and others don't. A genetic component may be a factor because this rare condition sometimes runs in families.