Prognosis | Trisomy 18

Prognosis Unfortunately, the prognosis for trisomy 18 is very poor. About 90% of the affected fetuses die in the womb during pregnancy and are not born alive. Unfortunately, the mortality of the born babies is also extremely high. On average, only about 5% of affected infants reach an age of more than 12 months. On … Prognosis | Trisomy 18