I was told that at the 20 week scan that they dont usually get concerned unless the baby measures more than i think she said 2 weeks either way. My DS was a week behind in measurements, so was measuring only 18 weeks when i was 19 weeks at my morph scan which id say was before a growth spurt as he soon caught up and was a very healthy 8lbs at birth.
I'd say he recently had a growth spurt
FWIW, my sister was told her DD was 9lbs at 37 weeks, she went into spontaneous labour at 38 weeks and her DD was 7lbs 13oz.
my u/s guy said they don't care if its measuring bigger, just if its a few weeks smaller than it should be. There's a long way to go and things usually even themselves out
DD3 was measuring ahead by 11 days at the 20 weeks scan (had a dating scan at 6w3d then she was ahead at the 12 weeks scan by 4 days then 11 days I think at the morph scan.) I didn't have GD and my midwife wasn't concerend in the least. DD3 was born after a spontaneous labour at 37+4, 8lb 6oz, my biggest by far but also my longest pregnancy, dd1 was 6lb 3oz at 36+2 and DD2 was 6lb 14oz at 35+6. DD2 and DD3 were on the higher end of the percentile for their size for gestation but I had straightforward vaginal births for all of them. Im glad my body knew they were ready to come as they could have been rather large if I got to 40+ weeks
Ultrasound scans can be innacurate for estimating birth size but can be useful for checking consistent growth, and as PZ said they can have growth spurts!
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