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Acknowledgement of parentage

The answer to the question: "Who is the mother? Who is the father?" is defined by the national law on maternity and paternity.

How is parentage established under Belgian law?


Inclusion of the mother's name on the birth certificate is enough to identify the child's mother.

If the name of the mother is not mentioned on the birth certificate or, in the absence of a birth certificate, the mother can still acknowledge her child.

Maternity can also be established by a court judgement.


The following regulations have been applicable since 1 July 2007.

If the child was born within a marriage, the mother's spouse is the father.

This rule does not apply if the child was born:

  1. more than 300 days after the legal confirmation of an agreement between the parties to reside separately, or after the legal authorization to reside separately.
  2. more than 300 days after the submission date of the petition for divorce by mutual consent.
  3. more than 300 days after a judgement by a Justice of the Peace authorising the parents to reside separately and less than 180 days after the date on which this decision expired or the parents reunited.
  4. more than 300 days after the date on which the spouses registered at different addresses according to the population register, the aliens register or a waiting list, as long as they have not subsequently been re-registered at the same address.

These exceptions do not apply if the spouses made a common statement at the time of birth.

If the mother remarries within 300 days of one of the three aforementioned situations and if the child is born during that marriage, the mother's "new" husband will be identified as the legal father of the child.

In the case of an extramarital child, paternity can also be acknowledged voluntarily.

Paternity can also be established through legal channels. 

When is an acknowledgement of parentage required?

If a child's parentage was not established in accordance with Belgian law at the time of birth, the child may be acknowledged at a later date by the biological father and/or biological mother.

Belgian law applies if a Belgian (mother/father) is acknowledging a child's parentage.

In accordance with Belgian law, a child can be acknowledged before (prenatal acknowledgement) or after birth (postnatal acknowledgement). It is even possible to acknowledge a child's parentage if the child is already an adult (18 years old).

In accordance with Belgian law, a child's parentage can be acknowledged in the birth certificate, a separate registration certificate or a deed drawn up by a solicitor. However, a child's parentage cannot be acknowledged in a will.

The certificate acknowledging a child's parentage can be drawn up in Belgium, when at least one of the following conditions is fulfilled:

  • The person making the acknowledgement is domiciled in Belgium at the time of the acknowledgement.
  • Belgium is the habitual residence of the person making the acknowledgement at the time of the acknowledgement.
  • The person making the acknowledgement is Belgian at the time of the acknowledgement.
  • The child was born in Belgium.
  • Belgium is the child's habitual residence at the time of the acknowledgement.

In some cases, a Belgian consulate abroad is authorised to draw up an acknowledgement of parentage for a child who is acknowledged by a person habitually resident abroad.

Acknowledgement by the mother

As a Belgian mother, you only need to acknowledge your child if a birth certificate has not been issued or if your name does not appear on the birth certificate. Neither the father nor the child are required to give their consent for the acknowledgement of parentage. Acknowledgement by the mother is extremely rare.

Acknowledgement by the father

Acknowledgement is only possible if paternity remains to be established or it is denied/contested.

Since 1 July 2007, the following regulations have applied to acknowledgement.

A child's parentage can only be acknowledged if the necessary consents are given. If the child is under 12 years of age, the mother must give her consent. If the child is between 12 and 18 years old, both the mother and child must give their consent. If the child is 18 years of age or over, consent is only required from the child.

If the Belgian father is married to a woman other than the child’s mother, his spouse must be informed of the acknowledgement of this child by either registered post or bailiff.

What about a foreign certificate which establishes parentage?

A foreign birth certificate which establishes the presumption of paternity or a foreign acknowledgement of parentage may potentially be recognised in Belgium. If it fulfils certain conditions, it can be transcribed into the civil status registers of a Belgian municipality. This makes it easy to obtain copies or extracts in Belgium.

Please see the Registration Certificates section for further information on this topic.

Does the acknowledged child have Belgian nationality?

Please see the Nationality section for further information on this topic.

Which surname will the acknowledged child be given?

Please see the Giving a name section for further information on this topic.

Further information can also be obtained by contacting: