A child conceived and born outside wedlock becomes legitimated by the subsequent valid marriage of the parents, provided that at the time of conception the parents were not disqualified by any impediment to marry each other, or were disqualified only because one or both were below eighteen. Legitimation takes effect by operation of law and retroacts to the time of the child's birth. It is recorded administratively with the local civil registrar.
Many Filipino couples have children before they marry, and marry later. The law has a mechanism for exactly this: legitimation, by which a child born outside wedlock becomes legitimate through the subsequent marriage of the parents. It is one of the few family law remedies that happens by operation of law rather than by court order — but it does not reach every child, and the disqualification catches families off guard.
Who Qualifies
Under the Family Code, only children conceived and born outside of wedlock of parents who, at the time of the conception of the former, were not disqualified by any impediment to marry each other may be legitimated.
The phrase to notice is “at the time of the conception.” The test looks back to when the child was conceived, not to when the parents eventually married. If, at that moment, either parent was legally incapable of marrying the other — most commonly because one of them was already married to somebody else — the child cannot be legitimated, even if the parents later marry perfectly validly after that prior marriage ends. This is the rule that disappoints most families: a later annulment does not retroactively make the child legitimable.
The RA 9858 Amendment
Republic Act No. 9858 softened one specific hardship. Before it, a child conceived when one or both parents were below the marrying age could not be legitimated, because minority was an impediment. The amendment allows the legitimation of children conceived and born outside of wedlock of parents who, at the time of conception, were disqualified only by reason of age from marrying each other. Teenage parents who marry when they are old enough can therefore have the child legitimated. The amendment addressed age — it did not open legitimation to children whose parents were disqualified for other reasons.
How It Happens: By Operation of Law
Legitimation takes place by the subsequent valid marriage of the parents. That is the operative act. There is no petition to a court, no hearing, and no judge. The marriage itself works the change in status, provided the child qualifies and filiation to both parents is established — which in practice means the father must have acknowledged the child.
What remains is recording. The legitimation is registered with the local civil registrar and annotated on the child's birth record, which is then transmitted to the PSA. This is an administrative process, and it is what makes the legitimation visible on the documents that matter — the birth certificate a school, an embassy, or a bank will actually look at.
The Effects Retroact to Birth
This is what makes legitimation valuable. Legitimated children enjoy the same rights as legitimate children, and the effects retroact to the time of the child's birth. The child is treated as having been legitimate all along. Concretely, that means:
- The right to bear the father's surname as a legitimate child;
- The right to legitimate filiation and to be under the joint parental authority of both parents; and
- Full successional rights as a legitimate child — a legitimate child's legitime is double that of an illegitimate child, and legitimation also removes the iron curtain that would otherwise bar the child from inheriting ab intestato from the legitimate relatives of the parents.
That last point is the one families underestimate. Legitimation does not merely change a label on a certificate; it changes what the child inherits, and from whom.
Legitimation Is Not Adoption, and Not RA 9255
Three remedies are constantly confused:
- Legitimation makes a child legitimate through the parents' subsequent marriage, with retroactive effect. It requires that the parents could have married each other at conception.
- RA 9255 merely allows an illegitimate child to use the father's surname where the father acknowledges the child. The child remains illegitimate — the surname changes, the status does not, and neither does the smaller legitime.
- Adoption, now administrative under RA 11642, confers the status of a legitimate child on someone who is not legitimable by marriage — which is the route for a child whose parents were disqualified at conception, including the common case of stepchild adoption.
Impugning It
Legitimation may be impugned by those who are prejudiced in their rights — typically other heirs — within the period the Code provides, counted from the time their cause of action accrues. The usual ground is that the child did not qualify in the first place, because an impediment existed at conception. Families should therefore get the dates right and keep the documents: the conception timeline, the prior marriage records, and the acknowledgment are exactly what a later challenge will attack.
Frequently Asked Questions
What is legitimation? It is the process by which a child conceived and born outside wedlock becomes legitimate through the subsequent valid marriage of the parents. It happens by operation of law, without any court proceeding, provided the child qualifies and filiation to both parents is established.
Can my child be legitimated if I was still married to someone else at the time? No. Legitimation requires that at the time of the child's conception the parents were not disqualified by any impediment to marry each other. If one parent was already married to another person then, the child cannot be legitimated even if the parents validly marry later.
What did RA 9858 change? It allows the legitimation of children conceived and born outside wedlock of parents who, at the time of conception, were disqualified only by reason of age from marrying each other. Teenage parents who later marry may therefore have the child legitimated. It did not extend legitimation to other impediments.
Is using the father's surname under RA 9255 the same as legitimation? No. RA 9255 only allows an acknowledged illegitimate child to use the father's surname; the child remains illegitimate, with the smaller legitime. Legitimation actually changes the child's status to legitimate, with effects retroacting to birth and full successional rights.
This commentary is for general informational purposes only and does not constitute legal advice. For guidance specific to your situation, please consult a licensed attorney.
If you are marrying and want your child's status and records corrected, our firm can guide you through legitimation or the right alternative. You may reach us via Viber or WhatsApp, call us at 0995 433 5550, or send an email to vivasnobles@gmail.com. We look forward to hearing from you.