Every person authorized to request a correction must complete an Affidavit and Certificate of Correction Request. You can contact the Illinois Department of Public Health (IDPH) to correct the error.Fill out the Affidavit and Certificate of Correction Request. The Cook County Clerk's office keeps official records of births that occur in Chicago and suburban Cook County. Delayed Records of Birth. 500.40. Amendments, Additions or Corrections to Vital Records. 500.43. "Section 500.43 Amendments to Birth Records Following Gender Reassignment. You'll need to fill out a Name Change Within the First Year of Life form. About two weeks after the birth of a child, the mother will get a Notification of Birth Registration form in the mail. If you are having technical difficulties, click here, and fill out the online form and submit.