Fetus with Down Syndrome twin

[ewmon]

Down Syndrome babies suffer from Trisomy 21. We know "Down-generated" substances enter the mother's blood through the utero-placental barrier. The mother's body obviously matured many years earlier, so its development is not affected. However, if the Down baby is a twin, it's possible that Down-generated material can pass into the blood of the normal twin and produced Down-related phenomena in the otherwise normal baby.