Prenatal Testing
Prenatal Testing is a common procedure during pregnancy. It can check for many diseases such as XYY, and Brittle Bone Disease.
Prenatal Testing can include a chorionic villi sampling, and amniocentesis.
If a family has a medical history of disease, prenatal testing is usually required.

A fetal embryo growing inside the womb with it's amniotic sac, developing placenta, and chorionic villi. http://embryology.med.unsw.edu.au/notes/Placenta.htm
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