Would you put one on the back of your bike yet? Or a bike trailer? Has anyone used one? Would you do a trailer or a seat? And obviously we would use a helmet so if anyone has a brand they prefer....mine is a bell and it works.

Then and now. How did my boy get so big?
Re: Bike seat/trailer
I actually saw a trailer topple once. I would love a cargo bike but they are so expensive!
In terms of a seat or trailer, my conclusion is that a trailer is better. I have personally never heard of one rolling, but they have roll bars For that, and if the kid is properly strapped in, he should be fine. If I fall, I'd rather she have that protection that not. There's also sun protection and many convert to a stroller with a few snaps. We are totally going this route.
Ours is from Mountain Equipment Coop. Not sure if that's a CDN store or not.
ETA: this is LiliD...apparently I have Another account that I randomly get signed into automatically? Sorry...
I'm really torn because I want it do we can run errands together. No one and I mean no one rides on the street here so I'd probably just stick to sidewalks and small streets anyway. It would make my life so much easier.
Haha! I have one of those accounts too! I just looked up those helmets and the nutcase ones are super cute. We have about 20 stores that carry them within a 25 mile radius, so I guess I know what we're doing tomorrow. We don't have mountain equipment coop, but we do have REI, which I am guessing is similar since it is a coop that sells outdoor equipment!
It's not too late!
I'd get a Burley trailer on craigslist.I like the lower center of gravity, and it gives you cargo for whatever errands you're running.
If you feel safe enough with a seat, then you could just get a little cargo wagon.
Both are okay at 1yr, with helmets. We have a bell, but I'd get a full skull one if you're out in traffic.
We got the ibert bike seat and we're getting DD a helmet for her birthday, and will start taking her for rides after her first birthday:
https://www.rei.com/product/831288/ibert-safe-t-seat-child-ccarriers
I decided on a seat because I read some scary stuff about the bumpiness kids encounter in trailers.
https://www.helmets.org/little1s.htm
In my research though, there was no clear winner in seats vs. trailers. There seem to be a lot of pros and cons of both.
We actually just bought a trailer at the beginning of the week. It's amazing! It's a Schwinn and hold two kids (for the future) or one in the middle, 5 point harness for both options. It has sun/weather shade, and a water bottle holder on both sides, plus cargo room in the back. The tires are 20 inch and it's very sturdy, also came with a third wheel so you can attach that and use it as a stroller.
We went to tons of stores before we found a helmet that would fit Bella, it's a Bell with lady bugs on it. A lot of the other 1+ helmets were too big, or stores only had 3+ or 5+ which was so irritating (why sell a trailer and not a helmet to fit the child going in the trailer?!?!?)
Any way we really like it! Highly recommend it!