You MUST have a birth certificate. If there is any problem, you have the right to beassisted, and they have the duty to give you assistance.Sometimes people do not have all the documents needed to register a birth, or for somereason are unable to get one of the documents.egistering An Adult Whether or not your parents are still alive to register you, the officer will want as muchevidence as you can possibly provide to provide to prove when and where you were born. These must include â¢ Your national identity card.â¢ A certificate of baptism if you have one.