At 39 weeks, my DD was estimated 8lb on growth scan. She was born at 40+1, weighing 10lb 2oz.
I know someone who was told they were going to have a huge baby from their growth scan, and the little one arrived weighing 5lb. I don't think the scans are always particularly accurate, and an experienced midwife is probably better at estimating a baby's size than a growth scan is - when I got to hospital in labour, the midwife who examined me knew immediately that DD was huge.
With DD1 I had a growth scan in the morning at 39 plus 6 and she measured at just under 5lb, I was induced that day due to IUGR and she was born that evening at 6lb 1oz, totally off for me.
I didn't find the midwifes much better though either tbh, whilst I was in labour with dd4 she said that she reckoned she would be pretty small, mid to high 6lb but definitely under the 7 mark, she was born an hour later at 7lb 9oz
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