I am 37 years old, I am 17 weeks pregnant, my second child. I did a prenatal screening test at 13 weeks, the result was Trisomy 21.18.13 low risk. But at 17 weeks, the ultrasound result showed a short nasal bone of 3.0. So I would like to ask, is it okay for a 17-week fetus to have a short nasal bone?

A baby's bones begin to form immediately after conception and continue to grow until adulthood. Mothers should look at the process of bone formation in their baby from the first soft tissues to birth to see the need for calcium supplementation during pregnancy.

In addition to checking the length of the femur, head circumference and abdominal diameter, pregnant mothers also need to pay attention to the length of the fetal nasal bone every week. This is one of the very important tests during pregnancy for the doctor to diagnose whether the fetus is likely to have Down syndrome while in the womb.