Charge the baby with rape. An unborn baby is, by definition, penetrating the private reproductive parts of a woman. According to numerous modern laws, a woman has the right to refuse consent for touching her reproductive parts, or if she consents, she may withdraw that consent at any time whereupon the person touching her is obliged to disengage immediately. Failure to disengage upon the instant constitutes rape. As the rapist is committing a crime, he may be removed by any force necessary, including lethal force.
An ugly response to a heinous assault on women's personhood, but hey, if we've stopped playing the Civilization game, anything goes.