Definition
Unborn persons are individuals who have been conceived but not yet born at the time a legally relevant event occurs — most commonly the execution of a will, the creation of a trust, or the vesting of a property interest. The law has long grappled with how to treat such persons, balancing two competing concerns: protecting the interests of those who may come into existence, and preventing property from being tied up indefinitely in anticipation of persons who may never be born or who may not survive birth.
The legal treatment of unborn persons arises across several distinct contexts:
1. Property and succession. An unborn child who is en ventre sa mere (in the womb) at the time of a testator's death or at the creation of a class gift is generally treated as a person already in existence for purposes of taking under a will or trust, provided the child is subsequently born alive. This fiction protects the child's inheritance rights against the accident of timing.
2. The rule against perpetuities. Unborn persons are central to perpetuities analysis. Because a life in being must be identifiable at the creation of an interest, interests contingent on unborn persons raise the question of whether vesting is sufficiently certain to occur within the perpetuities period. The classic "fertile octogenarian" and "unborn widow" problems both turn on the theoretical possibility of unborn persons defeating vesting certainty.
3. Tort law. Whether an unborn person may be the victim of a tortious act — and whether a cause of action survives or arises on their behalf — varies significantly by jurisdiction and has evolved substantially over the twentieth century.
4. Criminal law. Some jurisdictions recognize an unborn child as a victim for purposes of homicide or assault statutes, either by statute or judicial interpretation.
Common Confusion
"Unborn persons" in legal sources almost always refers to property and succession law, not to constitutional or reproductive rights law. Researchers conflating this term with the separate body of law concerning fetal personhood under constitutional doctrine — particularly as developed after Roe v. Wade and its successors — will be looking in the wrong place. Historical legal dictionary entries under "unborn persons" address the property fiction of the child en ventre sa mere; they do not address the constitutional question of whether an unborn child possesses rights against state or private actors. These are distinct legal problems with distinct literatures.
Similarly, "unborn persons" should not be confused with "after-born children" (pretermitted heirs), who are persons born after a will is executed but who were living at the testator's death. The legal treatment of each category differs.
Why It Matters in Research
Researchers working in historical sources must track two separate threads simultaneously: the common law property fiction and the perpetuities doctrine. These threads interact but are not identical, and historical dictionaries — including Rapalje & Lawrence — address them under cross-references rather than a standalone entry. Rapalje & Lawrence directs readers to IN VENTRE SA MERE and PERPETUITY rather than treating "unborn persons" as an independent headword. This means a researcher relying on a single entry will miss the full picture. Always follow both cross-references.
The phrase "en ventre sa mere" dominates older primary sources. If you are searching historical case reporters, equity digests, or chancery records, the Latin phrase will return more results than any English equivalent.
In perpetuities research, the treatment of unborn persons shifted dramatically in the twentieth century. The common law rule required absolute certainty of vesting; because unborn persons could theoretically extend a measuring life beyond any living persons, interests contingent on them were frequently void. The Uniform Statutory Rule Against Perpetuities (USRAP) and the move toward wait-and-see approaches substantially relaxed this analysis. Research that draws on pre-twentieth-century sources without accounting for this shift will misstate modern law.
In tort and criminal law, the twentieth century saw a major doctrinal reversal. Early common law generally held that no tort action lay for injuries to an unborn child. Beginning in the mid-twentieth century, most American jurisdictions recognized prenatal injury claims, provided the child was born alive. This evolution is not reflected in nineteenth-century dictionaries and must be sourced from case law and statutory compilations directly.
For researchers using the Law Mind corpus, note that the property dimensions of this term connect to real and personal property doctrine, while the tort dimensions connect to intentional and negligence torts. Neither encyclopedia entry will give a complete picture on its own.
Historical Dictionary Support
Rapalje & Lawrence does not carry a standalone entry for "unborn persons," instead cross-referencing IN VENTRE SA MERE and PERPETUITY. This is consistent with the treatment in most nineteenth-century legal dictionaries, which handled the subject through the Latin term rather than the English gloss. The cross-reference to PERPETUITY signals that nineteenth-century legal practice treated the status of unborn persons primarily as a problem of future interests and the rule against perpetuities, not as a freestanding question of legal personality.
Bouvier's Law Dictionary and Black's Law Dictionary (early editions) similarly address the concept under IN VENTRE SA MERE, confirming that the Latin formulation was the operative term of art across the common law tradition. What historical dictionaries largely omit is any treatment of unborn persons in tort or criminal law — an absence that accurately reflects the state of doctrine at the time but creates a gap for modern researchers working backward from twentieth-century cases.
Jurisdictional Note
The recognition of unborn persons as crime victims varies substantially by state statute. A minority of states extend homicide liability to the destruction of a fetus at any stage; others require viability; still others limit protection to the late stages of pregnancy. Federal law under the Unborn Victims of Violence Act (18 U.S.C. § 1841) creates a separate offense for harm to an unborn child during the commission of certain federal crimes. Researchers must consult jurisdiction-specific statutes and cannot rely on a uniform common law rule.
Encyclopedia Cross-Reference
The Law Mind Torts & Personal Injury Encyclopedia: Intentional Torts — Persons — Defense of Property (Real and Personal) [torts_96] (for context on legally cognizable persons in tort doctrine)