Many later term abortions are due to the discovery of a severe fetal abnormality. Let's focus on one in particular: anencephaly. This means the absence of most or all of the brain. This is a condition incompatible with life -- if not stillborn, the baby will almost always die within a few hours or days.
Anencephaly occurs at around 1 in 10,000 pregnancies, with over 90% of women who discover their fetus is suffering the condition choosing to abort.
If you are "pro-life", would you also ban abortions of anencephalic fetuses?
Now, anencephaly is essentially a condition incompatible with life. If this were not the case -- if the baby could continue to live without a brain, but be deaf, blind and incapable of any thought or consciousness, and with only reflex response to sensation including pain -- would you believe that the pregnancy should be made to continue?