We had extra scans a babba head was small below 3rd centile but at last was on 18th so haven't had anymore, and they believe all be ok. I know for sure if they worried they would get u see a consultant like we did, at 20wk scan they got us back for indepth scan 2days later, they checked everything and all organs etc seem fine but I'm scared that due date morro, once she born they find something wrong! But tryin look forward to it and not worry, as I know like say if they thought anything to worry bout would do tests as they talked us bout amino but when went bk they didn't offer as had grown on curve. I'm sure ur babba be fine and least if worried ur further along so can be born asap if needed, I'm sure they just like worry us! Wishin u all best + don't google I did and do and spend hours in tears with worry!