Because of the principle of self-defense, the exceptions for rape and incest must remain legal ... pregnancy does increase mortality thus a female who is raped or parents who discover pregnancy due to incest must be able to protect. BUT, if the pregnancy termination does not happen early, immediately, then the self-defense should not be an automatic death sentence for an innocent other. And again, exceptions should not argue the rule.
The principle of self-defense does not apply here, because the baby is not responsible for the attack on the mother. The baby is the result of the attack, and thus should not be held responsible for the actions of his or her parents.