It's no one's business but the woman gestating the child.

As civilized people, there is a point where the woman's liberty becomes unbearably distasteful to the society in which she lives. At that point even a free society must assume a degree of hypocrisy and flouting of its principles of liberty.

We don't have a natural right to prohibit abortion after the point of viability but most normal people, regardless of any devotion to less government and free choice, cannot tolerate for themselves that we might allow abortion past 24 weeks. It is very repugnant at that degree of development since the child has a chance at surviving outside the womb. Of course surviving does not necessarily mean a healthy independent life post-birth and there are always dreadful situations where a post- theoretical viability should not preclude a medical justification for abortion.

Nothing in the governance of human society is tidy and neat.