So we had 2 anatomy scans about 2.5 weeks apart. The first one (20 weeks) showed our little girls head measuring in the 39th percentile. We had to go for a follow up 18 days later because of her positioning, but this time she showed as being in only the 3rd percentile for head circumference. Is this even possible? My dr seems to think it was a measurement mistake but obviously I am concerned. I have a follow up next month but I’m not sure I can wait that long to hear if she’s ok or not. Anyone?