189 checklist 明确说了 没有出生证的情况, 可以用certified 护照来代替出生公证;
Scanned colour copy of your birth registration, and that of all people included in the application, showing the names of both parents. If you do not have a birth certificate, provide a certified scanned colour copy of the identification pages of at least one of the following:
passport
family book showing both parents’ names
identification document issued by the government
document issued by a court that verifies the person’s identity
other acceptable evidence that you are who you claim to be. http://www.immi.gov.au/Visas/Pages/checklists/189.aspx