Okla. Stat. tit. 10, § 7800
The mother of a child whose paternity has not been established is presumed to have custody of the child until such time as the paternity of the child has been established pursuant to Sections 7700-101 through 7700-902 of Title 10 of the Oklahoma Statutes. The parents of a child whose paternity is established are presumed to each have custody of the child until determined otherwise by a court. Until otherwise ordered by a court, written agreements, preferably agreements that are the result of mediation, are encouraged to document the scope of the legal and physical custody of the respective parents.
Added by Laws 2010, HB 1964, c. 358, § 1, emerg. eff. June 7, 2010.