Spousal PR application doesn't need proof of income. Its been that way for many of years and IRCC has approved alot of spousal PR where the sponsor is unemployed. Proof of income is only needed for specific situation for Spousal PR is when the spouse has kids who are not PR or considered a Canadian Citizen by birth.OMG , seems something wrong with you... download the checklist once you choose the options....
So OP's baby would be a Canadian Citizen by birth so she doesn't need to show any proof of income for dependents.