Wyo. Stat. § 14-2-504 (2026)

(a)   A man is presumed to be the father of a child if:

          (i) He and the mother of the child are married to
each other and the child is born during the marriage;

          (ii) He and the mother of the child were married to
each other and the child is born within three hundred (300) days
after the marriage is terminated by death, annulment,
declaration of invalidity, divorce or after the entry of a
decree of separation;

          (iii) Before the birth of the child, he and the
mother of the child married each other in apparent compliance
with law, even if the attempted marriage is or could be declared
invalid, and the child is born during the invalid marriage or
within three hundred (300) days after its termination by death,
annulment, declaration of invalidity, divorce or after the entry
of a decree of separation;
          (iv) After the birth of the child, he and the mother
of the child married each other in apparent compliance with law,
whether or not the marriage is or could be declared invalid, and
he voluntarily asserted his paternity of the child, and:

               (A) The assertion is in a record filed with the
state office of vital records;

               (B) He agreed to be and is named as the child's
father on the child's birth certificate; or

                  (C)   He promised in a record to support the child
as his own.

          (v) For the first two (2) years of the child's life,
he resided in the same household with the child and openly held
out the child as his own.

     (b) A presumption of paternity established under this
section may be rebutted only by an adjudication under article 8
of this act.