AAHHHHHH MAN!! I love love love Canada!! We have a summer cabin up on Lake of the Woods. We got up there a couple times a year and our family (6 different households) and all are on a first name basis with a couple of the border guards being we go up there the same time of every year for the last 50 years or so. (The cabin started with my grandparents when they first got married)
We've never had to worry about bringing anything into Canada...just the occasional rabies certificate. It is usually going back into the US that you'll get questions. How many fish you bring back, how much you have in purchases, etc. (our family goes up there and lives off of fish so we bring back walleye and trout)
Have fun!! We want to see pics of your new baby as soon as you get them! Ha ha!