I have a condition called "Single Umbilical Artery" or "Two-Vessel Cord," and as a result, I have monthly ultrasounds. The primary concern is that intra-uterine growth restriction is very common in a SUA, so the perinatologists are keeping a close eye on the baby's growth (its' also linked to all kinds of horrible things, but it looks like we are totally in the clear for that stuff).
Here's the thing - not only is baby not measuring small, baby is supposedly measuring several weeks ahead. Because I changed my perinatologist care, the last three ultrasounds I had were with three different practices. Each one of them said baby is measuring ahead. When we asked for specifics and percentiles, all three pretty much said the same thing - baby is measuring in 90th percentile. Well, that doesn't seem so weird because my husband, my daughter, and I are all tall and solid people. No one is ever going to accuse any of us of being "petite."
Fortunately my midwives have shrugged it off, but I am concerned that the perinatologists are going to make a big deal out of it as we get towards the end. We were told that baby is measuring 6.3 lbs @ 33 weeks. Which would put us on track to have a 9.8lb baby - that doesn't scare me. Over 10 and I'm a little scared, but I still wouldn't change anything. My fundal height was 33 @ 33 weeks so what gives? Oh, and the perinatologist said that at the current weight I am measuring at 36 weeks when I'm really only 33.
I would think that the ultrasounds aren't accurate, but 3 different people/practices have told us the exact same thing. Why is this even an issue though? My first daughter was 8 lbs and I had NO problem pushing her out. My only difficulty during her labor was that it was insanely long. The pushing part was reasonably fast.