👪 How is the paternity of a child born outside marriage established?

With conditions

Quick answer

It depends — how paternity is established changes according to whether the child is born inside or outside marriage. The common myth is that “the father must always be proven in court”. Not necessarily. Under the Family Code (Law no. 9062/2003), a child born during marriage is presumed to be the child of the mother's husband — paternity is recognised automatically, with no procedure. When the child is born outside marriage, paternity can be acknowledged by a voluntary declaration before the civil-status registrar (or by will). This acknowledgment is valid when the mother gives her consent, which is communicated to the civil-status registrar. If the mother objects or does not reply within 1 month of the notice, the man who has acknowledged the child can go to court to prove paternity. An acknowledgment once made cannot be revoked, not even when made by will, and a court decision on paternity has effect from the child's birth.

📋 The rules

Under the Family Code (Law no. 9062/2003), a child born during marriage is presumed the husband's child; paternity is recognised without any special procedure.
Outside marriage, paternity is acknowledged by a voluntary declaration before the civil-status registrar or by will.
Voluntary acknowledgment is valid when the mother gives her consent, which is communicated to the civil-status registrar.
If the mother objects or does not reply within 1 month, the man who has acknowledged the child can go to court to prove paternity.
An acknowledgment once made cannot be revoked (not even by will); a court decision on paternity has effect from the child's birth.

🔓 Exceptions

Where there is doubt, paternity can be proven or contested in court with evidence, including DNA testing.
Children born outside marriage have the same rights as those born in marriage, including maintenance and inheritance from the parent.
The presumption of paternity in marriage can be contested by a special action (denial of paternity) within the legal time limits and conditions.

⚠️ Penalties & fines

There is no fine here, but long-lasting consequences for the child and the parents. If paternity is not acknowledged, the child stays on the birth record without a father, which denies the right to maintenance (child support), inheritance and a surname from the father, as well as benefits that depend on the parental tie. The mother may be left to carry the economic burden alone, while a father who refuses can be ordered by a court to acknowledge paternity and pay backdated child support. Conversely, a hasty acknowledgment is not undone: because an acknowledgment cannot be revoked, the person who declares risks staying the legal father even if the opposite is later proven, except through a special denial action. The real cost, then, is not measured in lek, but in the child's rights, the financial duties and the court proceedings that arise from an unsettled situation.

📎 Official sources

Last verified: 2026-07-12

❓ Frequently asked

Is the father recognised automatically when the child is born in marriage?

Yes, under the Family Code a child born during marriage is presumed to be the child of the mother's husband. This means paternity is recognised with no special procedure, unlike a child born outside marriage, where a declaration or court is needed.

How do I acknowledge paternity for a child born outside marriage?

You can acknowledge paternity by a voluntary declaration before the civil-status registrar or by will. This acknowledgment becomes valid when the mother gives her consent, which is communicated to the civil-status registrar.

What happens if the mother objects to the acknowledgment?

If the mother objects or does not reply within one month of the notice, the man who has acknowledged the child can go to court. In court paternity is proven with evidence, including DNA testing, and the decision has effect from the child's birth.

Can I withdraw an acknowledgment of paternity?

No, an acknowledgment once made cannot be revoked, not even when made by will. That is why the declaration must be made carefully, because afterwards reversal is only possible through a special denial-of-paternity action in court.

Does a child born outside marriage have the same rights?

Yes, children born outside marriage have the same rights as those born in marriage. This includes maintenance, a surname and inheritance from the parent, so acknowledging paternity is essential to secure these rights.

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