Leonard 25, and Rachel 23, discovered that they are Tay-Sachs carriers after Rachel has become pregnant, and the doctor informs that they have a one-in-four chance of bearing a Tay-Sachs child. Tay-Sachs is a fatal disease that is both degenerative and particularly horrible. They decided to wait until the fourth month of Rachel's pregnancy to have an amniocentesis performed. The results, which they received in Rachel's fifth month of pregnancy, show that she will indeed give birth to a child with Tay-Sachs.
What should they do? And why?