No Occupation shown on either mine or my brothers, In fact no area for that.
Do you have a full copy of your own birth cert or just an extract? These are the information fields that should be on it....
Child
When and where born
Name of child and whether present or not (child was with parent at time of registration)
Sex
Father
Name and surname
Rank or profession
Age
Birthplace
Mother
Name and maiden surname
Age
Birthplace
Parents
When and where married
Informant
Signature
Description
Residence
If entry is a correction of a former entry
Registrar
When registered
Signature of registrar
Name if added after birth
Debra 
Yes its a full, cost $33. I understand from the BDM site
Birth Certificate Fields
The certificate will only have information in a field if it was collected and provided at the time of registration.
My brothers is one those fancy ones with a picture. So thats a full one as well.
A lot the information on these cert has been fudged etc by my Mother or/and father, I assume this is because they really did not want be found. Considering they had been living together since 1957ish and had brought that house in 62 there abouts.
as an example on mine APRIL 1959,
My Mum is FAYE HILL
Her surname/family name at birth PETERSON
and her age 28
The family name is really Smith, I guess PETERSON is a mix of my name and being a son. ;-)
On my brothers. in March 1960
Her name is FAYE HILL
Her surname/family name at birth SMITH
and her age is now 30
No where is her real name shown, i.e Maureen Fay and she was born 3 Nov 1929