mine did at 31 or 32 weeks I can't remember which was my last ultrasound. I think 31 weeks she was in the 30th percentile I think she weighed like 3 pounds. my Dr said she was just little like I am
Mine current baby has measured large. I am pretty sure they are off on the due date. my last baby measured right on par each time. so i honestly couldn't say. if you are going by ultrasounds there is actually several ounces they could be off by. even fundus height isn't a perfected science