Mo. Rev. Stat. § 474.070
Current with changes from the 2023 Legislative Session
If a man, having by a woman a child or children, afterward intermarries with her and recognizes the child or children to be his, they are thereby legitimated.
§ 474.070, RSMo
RSMo 1939 § 315, A.L. 1955 p. 385 § 242