Mo. Rev. Stat. § 507.110
Current with changes from the 2023 Legislative Session
Suits by infants may only be commenced and prosecuted, either: First, by a duly appointed guardian or conservator of such infant; or, second, by a next friend appointed for him in such suit; or, third, if asserted by counterclaim, by a guardian ad litem.
§ 507.110, RSMo
RSMo 1939 § 859, A.L. 1959 H.B. 537, A.L. 1983 S.B. 44 & 45