The risks are usually because the placenta can start breaking down and not functioning as it should, I had scans every 2 days from 6 days overdue heading to my due date.. Interestingly the last scan the day before JJ was born I asked what size he was and she said - oh he looks average and he was 10lb so it is clearly not a precise science guessing the weight of these babies! I know there are loads of people even on here that have had sizing scans that are way off - so something for her to consider as well xoxxo