To renew a child’s Canadian Passport you require application form: PPTC 155
A document to support the child’s identity is not required, however you are required to provide the child’s proof of Canadian Citizenship. The only documents accepted are entitled “Birth Certificate” or “Certificate of Birth” issued by a provincial/territorial authority in Canada. Where possible it is recommended a long-form birth certificate showing both parents is provided.
You will need to also enclose any valid Canadian passport, certificate of identity or refugee travel document issued to the child. If the child’s current passport expires more than 12 months from the date of submission of the application, provide a written explanation as to why you are applying at this time. Should Passport Canada not be satisfied that you have a valid reason for applying early, your application for a new passport may be refused.