Article 657

A contestation of paternity declared well-founded by the Court, has retroactive effect back to the moment of the child’s birth.

Rights acquired by third parties shall however be respected. Persons who have acquired rights in accordance with this Code’s provisions on Successions are not considered to be third parties.

There shall be no obligation to restitute costs of support nor of revenues from the parental use of the child’s assets.

If a person loses his rights because of the retroactive effect, he shall not have the obligation to restitute property which he has disposed of at the moment at which the proceedings were instituted, or, if this person himself has instituted the proceedings, at the moment at which he could reasonably foresee that he would institute proceedings.