La. Civ. Code art. 195
Current with changes from the 2024 legislative session from Acts 3, and 6-104
A man who marries the mother of a child not filiated to another man and who, with the concurrence of the mother, acknowledges the child by authentic act is presumed to be the father of that child.
The husband may disavow paternity of the child as provided in Article 187. Revocation of the authentic act of acknowledgment alone is not sufficient to rebut the presumption of paternity created by this Article.
The action for disavowal is subject to a peremptive period of one hundred eighty days. This peremptive period commences to run from the day of the marriage or the acknowledgment, whichever occurs later.
La. C.C. § 195