Hi Cheryl,
I had an u/s at 39 weeks as they were worried about DS's growth, they thought he hadn't grown in the 3 weeks prior. Anyway, they measured his abdominal circ and it was below the 1st percentile (so off the chart) and I was induced due to this a few days later.
I was in high risk and they had a humi crib ready for him as they though he'd be in SC for a few days.
To put a long story short, he was born perfect, although his abdominal circ was small but not as small as they said. He was 2.88kg (6lb 5oz) and didn't need the humi crib at all and had apgar scores of 9 and 9.
He is now still only always between the 3rd and 10th percentile for his weight but on the 95th for height, so a light weight tall bubba, we call him our lean mean machine
So don't let it worry you, chances are bubba is just fine and will be perfect!