Hi I did my anatomical US and it shows that sonographic gestational age of fetus is 19 weeks and 4 days. However, BPD is 4.50 cm/ 19 wks 5 days, HC: 16.73 cm/ 19 wks 3 days, AC: 13.23 cm/ 18 weeks 6 days , FL:3.18 cm/ 20 wks,Cerebellum 1.68 cm /17 wks 6 days and Nuchal fold 3.27 mm. Is is normal to have a smaller cerebellum age in weeks? What is the normal range for cerebellum ? What does the number mean? However, the report says everything is normal!