Anyone else have 2 vessel umbilical cord baby?

Hey this is my second pregnancy and second baby girl with single umbilical artery (SIU) if your reading this and not sure what that is, there are three atertys in the umbilical cord one for oxygen,waste and nutrition. So in the aterty for nutrition the baby is missing one vessel from the two. And they say like 15% of SIU babies have some health defects so we get placed in a high risk category and the babies are born smaller birth weights most of the time. This is my second girl with this (1st was 5lb6oz no birth defects) and they can't explain why I keep having it occur. I can never find anyone else with 2 vessel babies and would be nice to compare baby weights from ultrasounds. I'm 28 weeks and at 25w baby was 1.11 lbs. Anyone else??