With the dates thing though Nelle, there have been women on here for example who know their dates and their cycles, but still don't quite know how they managed to fall pg that cycle because maybe their body threw them a curveball and they ovulated early, or late or even twice or their DH's swimmers have super powers LOL, or they may have breakthrough bleeding that makes them think they aren't pg only to find out later they are etc. And the sonographer is no expert by any stretch of the imagination! If they didn't have that little machine to calculate size and averages, then they would have no idea either. I don't think this issue is even really about sonograhers, but about the trend maternal heathcare has taken now, where it is accepted that a woman has at least 3 scans for her pg, maybe more if something happens to create enough concern to justify more scans later on. It's not one single thing, but many things which have created it.