Utah Code § 81-5-705: Limitation on husband's dispute of paternity.

(1) Except as otherwise provided in Subsection (2), the husband of a wife who gives birth to a child by means of assisted reproduction may not challenge the husband's paternity of the child unless:

(a) within two years after learning of the birth of the child the husband commences a proceeding to adjudicate the husband's paternity; and

(b) the tribunal finds that the husband did not consent to the assisted reproduction, before or after the birth of the child.

(2) A proceeding to adjudicate paternity may be maintained at any time if the tribunal determines that:

(a) the husband did not provide sperm for, or before or after the birth of the child consent to, assisted reproduction by the husband's wife;

(b) the husband and the birth mother of the child have not cohabited since the probable time of assisted reproduction; and

(c) the husband never openly treated the child as the husband's own.

(3) The limitation provided in this section applies to a marriage declared invalid after assisted reproduction.