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!
