Scans with Miss I the whole way through put her as way ahead of dates. The scan I had at 32 or 33 weeks indicated from hc and limb length that she was going to be a very large baby. She was born at 40+5 weighing 3.5kgs and 50cm long - smack on average. Scans with Miss A put her as being a little on the small side. She was born at 41+1 at a smidge under 4kgs.

SIL was induced at 38 weeks because scans indicated her baby was small and the OB was concerned about the placenta's effectiveness. He was born at 4.2kgs

I wouldn't put too much faith in them TBH, certainly not from my experience.