If you are applying for a minor.......all questions in the application apply to the minor.....refer....
If you live outside Canada and the United States.
Since your son was born outside Canada......you need to apply for the Proof of Canadian Citizenship through the Canadian embassy in the country where the baby was born.
Some Canadian embassy abroad do not accept mailed in applications and require in-person applications with original documents........so will advice you check with the embassy to know embassy specific requirements.
Since you the father is currently residing inside Canada, you may have to mail certified notarized copy of your Canadian Citizenship Certificate to your wife to include in the application.......because the Canadian parent citizenship proof will be required.
The current processing time for a straight forward application for Proof of Citizenship for applicants in Canada and US varies from 2 to 5 months.......and an additional 1 to 3 months is required to mail approved citizenship certificate via embassy abroad.
Although, you will apply abroad, the application for proof of citizenship certificate is processed in IRCC Canada and not at the embassy abroad.
Will advice when you complete the application form - CIT0001E that you fill only the
City Name in the
Home Address field (do not provide the home address) and fill the
father Canadian Address as the
Mailing Address in the form.......so when the certificate is approved it will be mailed to your Canadian Address which will help eliminate the additional 1 to 3 months required to mail approved citizenship certificate from Canada via embassy abroad to the applicant.