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Viability is a popular choice for a point after which abortion is morally much more serious. This may be due to the fact that Justice Blackmun used viability as a criterion in Roe v. Wade.

In any case, if you want to make use of viability, you must clarify why it matters. Does a fetus become a person at the time it becomes viable? Does it become a person because it is viable? Does it become the sort of being that can have rights? Does it acquire a new or stronger right? Or is it that the rights of the mother and the fetus (if it has any) do not change at viability but are applied to a new situation?

If you answer yes to any of these questions, what is the reason for your answer?