As per Trisha question on births for any of the children in Victoria
Here is the information you can expect to see on a Victoria Birth Certificate
s
Date and place of birth;
name of child and whether present or not;
name of parents (including mother's maiden name);
occupation of parents; ages and birthplace of parents; date and place of marriage of parents;
previous children of their marriage noting living or deceased;
signature, description and address of the person who gave the information; names of witnesses;
date and place of registation.
you can order and download on line from the Victoria BDM
It is best if you have the registration numbers other wise you have to pay .99 to search for it.
.
http://online.justice.vic.gov.au/bdm/homeJEnn