Check which documents to provide by post or upload.
Are you changing your child’s name? Was the child born overseas? If yes, you need different identity documents.
Do you have both of these?

A current Australian driver licence
and

A current Australian passport



Yes, I have both of these No, I don't have both
Related information
Do I need to prove my identity?
Completing online proof of identity with Service Victoria
If your documents show a different name