Hi, I am also in the process of adding my new born baby to my application. Did you filled IMM5406 twice? one for you and one for your spouse? How long it took to clear new born medical? what are all other document they requested after that. my visa office is also Ottawa.I am currently in IP1. I added my child recently. Raised a CSE on 17 Sept and then got a reply from them on 30 Sept that I need to email my visa office which was Ottawa. I did the same on 30th Sept and on 1st Oct I got a message in my account from IRCC with the placeholder in my CIC account to upload the child documents. I uploaded the same on 3rd October (Fees, IMM0008, IMM5406, Passport, Birth Certi and Medicals) and on 4th October the child is added to my profile. I am able to see Child's name in the list of dependants with a UCI number.
Hope this helps.
Need advice.
Thank you.