Section 7540 - Presumed to be child of marriage; exception(a) Except as provided in Section 7541, the child of spouses who cohabited at the time of conception and birth is conclusively presumed to be a child of the marriage.(b) The conclusive marital presumption in subdivision (a) does not apply if the court determines that the husband of the woman who gave birth was impotent or sterile at the time of conception and that the child was not conceived through assisted reproduction.Added by Stats 2018 ch 876 (AB 2684),s 5, eff. 1/1/2019.