(a) If neither parent of the newborn child whose birth is unattended as provided in section 338-5 is able to prepare a birth certificate, the local agent of the department of health shall secure the necessary information from any person having knowledge of the birth and prepare and file the certificate.
(b) The department shall prescribe the time within which a supplementary report furnishing information omitted on the original certificate may be returned for the purpose of completing the certificate. Certificates of birth completed by a supplementary report shall not be considered as "delayed" or "altered".