Every person authorized to request a correction must complete an Affidavit and Certificate of Correction Request. "What you want corrected" should indicate the item (e.g., child's first name, mother's date of birth, father's place of birth, marital status). 8. The Cook County Clerk's office keeps official records of births that occur in Chicago and suburban Cook County. You can contact the Illinois Department of Public Health (IDPH) to correct the error. Fill out the Affidavit and Certificate of Correction Request. Please include a copy of current photo identification of person requesting the correction. Please print or type clearly. Birth Correction forms are available at the City Clerk's Office. In order to make a correction to your birth certificate, you must fill out and submit an Affidavit and Certificate of Correction Request.