Hi MSK..
You are on my Boat brother..
I am waiting for the same thing.
Now, Once you submit Passport for your Newborn, next CO will Grant Visa 489 to your newborn and then he will add your newborn on your application(That mean after that if you log on to your immi account you can see your newborn as a dependant in the system, then you will get bridging visa for you new born, and that's end.. Now you have to wait as me for next CO. This is my Story.. If you are lucky you will have different one...
The CO who granted 489 visa to my newborn he didn't contact me.. I got visa 489 grant email for my newborn in my inbox and bridging visa. that's the end..
I applied on 16/08/16 and Newborn birth date 01/02/17.
Hope you will get your grant soon.