So that means a third of them ARE viable. Six months is unforgivable, except for the mother’s life and insurmountable birth defects (which are almost always detected much earlier).you really need to learn to write more clearly.
24 weeks is considered by Doctors to be the earliest viability of a fetus and even then there is only a 65% chance of survival.
How little do you want to hold women responsible, and at the expense of torturing a viable or near-viable unborn child? In the unlikely instance of a birth control failure (99% effective rate when used correctly and conssitently), 15 weeks still gives the mother a good two months to decide whether or not to kill her baby. That’s enough.