Ala. Code § 26-17-609: Limitation: Child Having Acknowledged.

(a) If a child has an acknowledged father, a signatory to the acknowledgment of paternity may maintain a proceeding seeking to rescind the acknowledgment or challenge the paternity of the child only within the time allowed under Section 26-17-307 or 26-17-308.

(b) If a child has an acknowledged father, an individual, who is not a signatory to the acknowledgment of paternity and who seeks an adjudication of paternity of the child may maintain a proceeding at any time after the effective date of the acknowledgment if the court determines that it is in the best interest of the child.