Mont. Code Ann. § 42-2-401
Child available for adoption -- voluntary acts of parents
42-2-401 . Child available for adoption -- voluntary acts of parents. A parent may voluntarily make a child available for adoption by:
(1) executing a voluntary relinquishment and consent to adoption;
(2) executing a denial of paternity; or
(3) submitting a notarized acknowledgment of paternity and a denial of any interest in custody of the child.