What are the fetal sign and symptoms of down syndrome?

Amno needed: You need an amniocentesis. There really are no overt symptoms that tell you you are carrying a fetus who hasadowns syndrome.

Maternal serum : Screening at 10-14 weeks + fetal ultrasound (fus) at 11-14 weeks + maternal "quad" screen at 16 weeks detects ~ 95% of fetuses with Down syndrome with <5% false-positive rate. Increased size of the fluid-filled space at the nape of the neck & abnormalities of blood flow in the heart are signs on early fus. Diagnostic testing is chorionic villus sampling at 10-12 weeks or amnio at 15-18 weeks.