Having been told by the sonographer, not to worry, I am doing exactly that! I had a growth scan last week at 28 weeks. The baby is currently breech, and due to this the sonographer was unable to get an accurate biparietal diameter measurement (this also happened at 20 week scan). So, the baby's head is way off the scale on the chart. Has anyone else encountered this? I am trying so hard not to worry that my baby has an abnormally small head, but I just can't seem to forget about it.