Okla. Stat. tit. 63, § 63-1-313: Delayed birth certificate

A. When the birth of a person born in this state has not been

registered, a certificate may be filed in accordance with

regulations of the State Commissioner of Health. Such certificate

shall be registered subject to such evidentiary requirements as the

Commissioner shall by regulation prescribe, to substantiate the

alleged facts of birth.

B. Certificates of birth registered one year or more after the

date of occurrence shall be marked "delayed" and show on their face

the date of the delayed registration.

C. A summary statement of the evidence submitted in support of

the delayed registration shall be endorsed on the certificate.

D. When an applicant does not submit the minimum documentation

required in the regulations for delayed registration, or when the

State Commissioner of Health finds reason to question the validity

or adequacy of the documentary evidence, the Commissioner shall not

register the delayed certificate and shall advise the applicant of

the reasons for his or her action.

E. Beginning on the effective date of this act, the biological

sex designation on a certificate of birth issued under this section

shall be either male or female and shall not be nonbinary or any

symbol representing a nonbinary designation including but not

limited to the letter "X".