Wyo. Stat. § 14-2-809: Limitation; child having acknowledged or adjudicated father.

(a) If a child has an acknowledged father, a signatory to the acknowledgment of paternity or denial of paternity may commence a proceeding seeking to rescind the acknowledgement or denial or challenge the paternity of the child only within the time allowed under W.S. 14-2-607 or 14-2-608.

(b) If a child has an acknowledged father or an adjudicated father, an individual, other than the child, who is neither a signatory to the acknowledgment of paternity nor a party to the adjudication and who seeks an adjudication of paternity of the child shall commence a proceeding not later than two (2) years after the effective date of the acknowledgment or adjudication.

(c) A proceeding under this section is subject to the application of the principles of estoppel established under W.S. 14-2-808.