Oh, one issue I just thought of that you should check: the infant sling (3 months or so) and the infant insert (up to about 18 months) might not work in the sidecar. Definitely check that before you decide. Those items are pretty necessary to make the trailer, at least, safe and comfortable for a small infant, but they are really meant to be used with the non-cycling conversion kits, like the jogger attachment, because they are not compatible with a helmet. Since the sidecar is only for cycling, they may not have made it compatible with those infant adapters.

We still use the infant insert but we have to remove the head support in order to accommodate the helmet. I definitely would not want to put a small baby in the trailer without those supports. The Chariot is really meant for bigger kids to sit upright, awake. It is not reclined, there is not a lot of head support, and without the extra infant support, it's just not suitable for tiny little babies, even those that can sit up.

Okay, I looked it up -- the baby supporter is compatible, the infant sling is not. You can't use the head support with a helmet, however.