Regardless of other traditions, the libertarian tradition provides no specific guidance on this fundamental bioethics issue. I again propose, based on ideas from Sigrid Fry-Revere and Hans Hoppe, that embryos or fetuses or babies become persons when they have developed the minimum biologic structure capable of engaging in propositional logic regardless if this capability is currently expressed or not. This means that an embryo or fetus or baby is a person when the embryo or fetus or baby has developed the appropriate neurologic structures needed for propositional logic (the basis of reason). I write "embryo or fetus or baby" because it is unclear at this time when this event occurs. This definition of personhood is certain to be controversial in libertarian circles, but any definition of personhood is controversial in libertarian circles.