I just wanted to add to this post, in case someone was looking for more recent info. on member experiences with SUA.
My daughter was born March 2008. At our 20 week scan they found out she had a 2 vessel cord, so we had extra monitoring through the rest of my pregnancy. She was born at full term, totally healthy, 8lbs 7oz. Months later she had a scan and her kidneys, etc. were all fine.
I would encourage any Mom whose baby is diagnosed with SUA to try and relax. Just make sure that you try to avoid prom/arom, pitocin and laying flat on your back during labor. If my midwife/doctor had been more aware of those issues, I probably would not have had a c/s.
Here is a good link:http://www.gentlebirth.org/archives/SUA.html