In the Philippines, the legal status of a child is categorized as either legitimate or illegitimate. While the law has evolved to provide more rights to illegitimate children, the process of legitimation remains a vital legal mechanism to elevate a child's status to that of a legitimate one, granting them the same rights and privileges as those born within a valid marriage.

What is Legitimation?

Legitimation is a remedy by which those who were born out of wedlock are considered legitimate by the subsequent valid marriage of their parents. It is governed primarily by the Family Code of the Philippines (as amended by Republic Act No. 9858).

The legal effect of legitimation is retroactive; the child enjoys the same rights as a legitimate child from the moment of their birth. These rights include:

The right to bear the surname of the father and the mother.
The right to receive support from parents and ascendants.
The right to legitime and other successional rights (inheritance).

Essential Requirements for Legitimation

For a child to be eligible for legitimation, the following criteria must be met:

Status at Conception: The child must be conceived and born outside of a valid marriage.
Legal Capacity to Marry: At the time of the child's conception, the parents must not have been disqualified by any legal impediment to marry each other.

Note: Republic Act No. 9858 expanded this to include children born to parents who were disqualified only because they were minor (under 18) at the time of conception.

Subsequent Valid Marriage: The parents must subsequently enter into a valid marriage.

Important Limitation: Children born to parents where one or both were already married to someone else at the time of conception (adulterous or bigamous relationships) cannot be legitimated, as there was a legal impediment to marry at the time of conception.

Documentary Requirements for Registration

To effect the change of status in the civil registry, the following documents must typically be submitted to the Local Civil Registrar (LCR) where the child’s birth was recorded:

Certificate of Marriage: A Philippine Statistics Authority (PSA) authenticated copy of the parents' marriage contract.
Certificate of Live Birth: The original or PSA copy of the child’s birth certificate.
Affidavit of Legitimation: An omnibus affidavit executed by both parents (or the surviving parent) stating:

The names of the parents and the child.
That at the time of the child’s conception, the parents were not disqualified by any impediment to marry.
That a valid marriage has since been celebrated.

CENOMAR: Certificate of No Marriage of both parents (to prove no prior legal impediments).
Death Certificate: Required if one parent is deceased prior to the application for legitimation.

The Process of Registration

Execution of Affidavit: The parents execute the Affidavit of Legitimation, which must be notarized.
Filing with the LCR: The documents are filed with the LCR of the city or municipality where the birth was registered. If the birth happened abroad, it is processed through the Philippine Consulate/Embassy.
Annotation of the Birth Certificate: The LCR will not issue a "new" birth certificate. Instead, they will annotate the existing birth certificate.

The original entry remains, but a marginal note is added stating that the child is now legitimated by virtue of the marriage of the parents.

Forwarding to the PSA: Once registered locally, the LCR forwards the annotated document to the PSA for updating in the national database.

Rights of the Legitimated Child

Once the process is complete, the child is legally indistinguishable from a child born during marriage. This specifically resolves issues regarding the use of the father's surname and ensures the child is a compulsory heir, entitled to a full share of the estate (whereas illegitimate children are generally entitled to only half the share of a legitimate child under the Civil Code).