Definition
A Latin term meaning "one who is about to be born" or "that which shall hereafter be born." In law, nasciturus refers to an unborn child — a child conceived but not yet delivered — particularly in contexts where legal rights or interests are attributed to that child in anticipation of live birth.
The term operates on a foundational legal fiction: that a child in the womb is treated as already born for certain purposes, provided it is subsequently born alive. This fiction — sometimes expressed as nasciturus pro iam nato habetur ("the unborn is regarded as already born") — underlies a wide range of legal protections and entitlements, from inheritance and property rights to tort claims and statutory protections.
In modern legal usage, nasciturus appears most often in:
1. Property and succession law: An unborn child's capacity to take under a will, trust, or intestacy scheme, contingent on live birth.
2. Family and matrimonial settlements: The designation of future children of a marriage as distinct from children already born (nati) at the time of the settlement.
3. Civil and tort law: The basis for claims on behalf of children injured before birth, including wrongful death actions brought after stillbirth in some jurisdictions.
4. Constitutional and statutory debate: The term appears in scholarly and legislative discussions about when legal personhood begins, particularly in civil law countries.
Common Confusion
Nasciturus is frequently paired with — and should be distinguished from — natus. Natus means "born" and refers to a child already in existence at the relevant legal moment. In marriage settlements and succession instruments, the two terms operated as a pair: natus described existing children, nasciturus described those yet to come. Conflating them produces serious misreadings of historical instruments. A settlement conferring benefits on the "nati and nascituri" of a marriage is conferring separate classes of interest on two distinct groups.
Additionally, nasciturus should not be confused with the broader modern concept of fetal personhood or legal personality. The traditional nasciturus doctrine is contingent — rights vest only if and when live birth occurs. It does not confer independent legal personality on the fetus as such, though some modern statutory regimes have moved toward that position, departing from the classical doctrine.
Core Elements
The traditional nasciturus doctrine rests on three conditions:
1. Conception: The child must have been conceived at the relevant time (e.g., at the testator's death, or at the date of the settlement).
2. Subsequent live birth: Rights attributed to the nasciturus are contingent. If the child is not born alive, the fiction collapses and no rights vest.
3. Purpose of protection: The fiction applies only where it benefits the unborn child. It is not applied against the child's interests.
These elements are drawn from Roman and civil law and transmitted through both common law equity and the civil law tradition. The contingency requirement is the most important feature distinguishing the doctrine from full legal personhood.
Why It Matters in Research
Nasciturus is a term that behaves differently across legal traditions, time periods, and subject-matter contexts — and historical sources often fail to capture that range.
In historical English sources, nasciturus appears almost exclusively in the context of marriage settlements and conveyancing, where the nati/nascituri distinction governed how future-born children took interests under settlements. Researchers reading 18th- and 19th-century equity materials will encounter the term in this narrow sense. Do not assume that usage maps onto the broader civil law doctrine.
The civil law tradition — Roman law, Scots law, South African law, and the mixed civilian systems — deploys nasciturus far more expansively, as a foundational concept in the law of persons. Burrill's citation to Mackeldey's Civil Law (§ 118) is the gateway to this tradition. Researchers working on comparative law, Scots private law, or South African succession law will find the term doing substantial jurisprudential work that English common law sources do not reflect.
In modern common law jurisdictions, the term itself rarely appears in statutes or judicial opinions, but the doctrine underlies a large body of case law on prenatal injury, wrongful death of a fetus, and the capacity of unborn children to take under wills and trusts. Researchers must learn to recognize the doctrine operating under different labels — "en ventre sa mere" is the Anglo-French equivalent used extensively in older English equity and trust law, and the two terms describe the same legal fiction from different linguistic traditions.
A significant modern development: some jurisdictions have legislated beyond the classical contingency requirement, conferring rights on unborn children without conditioning them on live birth. This is a departure from the nasciturus doctrine proper. Researchers tracking fetal rights legislation must distinguish the classical doctrine from these modern extensions to avoid anachronistic readings in either direction.
Anderson's entry ("See NATUS") is unhelpfully terse. Researchers relying on Anderson alone will miss the substance entirely.
Historical Dictionary Support
The historical dictionaries agree on the core: nasciturus means an unborn child, contrasted with natus, and the term originates in Roman civil law. Bouvier and Black (both editions) emphasize the marriage settlement context. Burrill goes deeper, situating the term in the civil law of persons with citations to Mackeldey and Taylor — the only historical entry that points researchers toward the doctrine's full jurisprudential scope.
None of the historical sources adequately covers the nasciturus fiction's application in tort law or prenatal injury claims, which became significant in the 20th century. None addresses the modern legislative expansions. The marriage settlement framing in Black's and Bouvier's reflects the primary common law use in their era but should not be mistaken for the term's full doctrinal range.
Jurisdictional Note
The nasciturus doctrine is most fully developed in civil law and mixed legal systems — Roman-Dutch law, Scots law, South African law, and Louisiana. In pure common law jurisdictions, the equivalent concept operates through the "en ventre sa mere" formulation in equity and trusts, and through judge-made prenatal injury doctrine in tort. Modern statutory law in various jurisdictions has modified, expanded, or codified the underlying principle in ways that may or may not track the classical contingency requirement.
Encyclopedia Cross-Reference
See Law Mind Encyclopedia: Fetal Rights and Legal Personhood; Unborn Children in Succession and Trust Law; En Ventre Sa Mere.