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Congratulations on your newborn! Since you already informed IRCC in your P1 reply and attached the hospital document and birth certificate application confirmation, that was a good step. However, I would recommend submitting an IRCC webform as well to formally report the change in family composition and provide the baby's details and supporting documents. Keep a copy of the webform confirmation.

It may affect the processing timeline because IRCC needs to review the newborn's situation and determine the required steps before finalizing your PR application. Hopefully, it won't cause a significant delay. Best wishes to your growing family!
Thank you so much for your advice and kind wishes!

Since I already informed IRCC in my P1 reply and attached the supporting documents, would there be any issues if I don't submit a separate webform?
 
For anyone who's reached the photo upload stage, just a small tip: double-check the photo dimensions and head positioning before submitting it. It's easy to overlook the framing, especially when preparing a digital photo yourself.

I found this guide useful for checking the Canadian PR card photo size and requirements before uploading.

Hopefully saves someone a bit of back and forth with the photo requirements. Good luck to everyone waiting for their eCOPR!