AussiePaki,

I am not sure what the correct procedure is but it will be helpful for you to give embassy a call and see what they say about it.

As i know that you may need to apply for Citizenship by Descent for your child first if you are an Australian and a Citizen of a different country as well. But please confirm these things with Embassy first as i will be going through the same situation in next few months and let me know as well.

Take care and congratulations to you.
Regards,
Snipers