Hi

Friend of mine just had twins. One of the twins had only one umbilical artery. I put a post here

https://www.bellybelly.com.au/forums...-one-twin.html

It only got one reply, but there was another thread about it after mine. Maybe try a search.

The twin also had another soft marker for DS, but they decided not to have further testing. Both babies were born healthy.

Take care,

Kate