Traveling to Toronto in October with child.

From Canadian Immigration website:
'Children under the age of 18 are considered minors in Canada. They must follow the same rules to enter Canada as any other visitor.' which I read to mean they need their own passport. If son is listed on one of your passports, that may work.
Here is the link for a fuller explanation, but it doesn't give the simple scenerio of traveling with both parents.
https://www.canada.ca/en/immigration-refugees-citizenship/services/visit-canada/minor-children-travelling-canada.html

Thank you. He is not traveling alone, so not sure a passport is necessary. I have read thus far that a copy of his Birth Cert could work but still reading. We are traveling out of Canada by land. Again still reading..
Thank you!

I still read it as needing a passport, but I recommend you call Canadian Immigration to find out - they are the border control - and you will enter Canada at Toronto Airport. That is the location that matters.

Your child needs a passport. It’s time to get moving. I recommend you pay for the expedited service since your trip is in a few weeks.

When we went there both my 3 year old and 5 year old required U.S passports. You are required to have a passport to enter Canada. Birth Certificate maybe used to enter U.S soil by land but you can't use it at the airport to enter Canada.

To reinforce what others have said, your son definitely needs a passport. You need to get on that ASAP - they offer an expedited service. We went with our young daughter to Canada last year, and they checked hers along with ours.

I clicked on that link that the first poster provided and I see no indication that anything but the child's own passport is acceptable. Those examples are only to indicate additional documentation that is required in certain scenarios such as a child travelling alone or with one parent, non-parent, etc. Even as a Canadian, our kids were always expected to have their own passports to get back into Canada.

The passport issue is not just a Canadian matter; your family will need proper documents to return to the US at either Buffalo or Niagara Falls. As well, you should look into how you will travel from Toronto to the US border. Going by rented car will be complicated since there is a heavy premium to drop a Canadian rental off in the US, and walking across whichever bridge you choose may or may not be allowed.