@roy0121 Can you please share your steps. Also, you said CIC confirmed you not to submit the passports, how did they inform you?
I am almost in a similar situation. Here is what I did.
1- AOR is 29th Apr. Xray of my wife was deferred because of her pregnancy.
2- We were blessed with a baby boy on 9th August 2018. At that time I was in IP1 without medical passed.
3- On 15th September, I was able to arrange all the documents of the child such as the birth certificate, passport, photo, fee payment. So I went to the same medical center and asked for his upfront medical. Also, I completed my wife's x-ray.
4- I raised an IRCC CSE web form on the same night to inform the birth and provided birth cert, passport, photo, fee receipt, and medical of the child.
5- On 18th September my status changed to Medical Passed. On 20th September the status changed to IP2.
6- On 25th September I received the PPR, yet there was no reply for the CSE web form.
7- On the same day, I wrote back to London Visa office about the birth and the Web form that I had already raised. I attached the same documents with the email. There was an auto-reply that they would get back in 28 days.
8- On 28th September I received an email from CIC in reply to my Web Form that they have forwarded my documents to London Visa office and they advised to contact the LVO directly also. Since I had already emailed them so I didn't write them again.
Now its 15 days past of the PPR and I am not sure what next to do. I don't want PPR to expire before getting any reply from LVO.