27w2d pregnant. 4d scan, femur length 47.8, should i worry for ds? everything else is perfect. efw ac/fl is 2lb7oz. does that mean a short baby?

Discuss with doc: Your doctor should be able to look at your overall pregnancy, family history and determine if you had maternal genetic screening done in the first and /or second trimester. They can then look at the presence of short femurs in the context of your overall pregnancy to provide guidance on whether or not the presence of short femurs is a cause for concern.