Age of infant for bike trailer?

[xeney]

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.

[singletrackmind]

When I told my son's pediatrician of my plan 'helmet' was the first thing out of her mouth, as if I'd have done anything different anyway. My son's head is small but I got lucky at a good LBS, helmet-wise. It was a Bell Boomerang, orange and yellow with construction trucks. I left the visor off.
I can see how a year would be better for the trailer, stronger muscles and all that. Unfortunately for my kid I couldn't stand the wait as it was so when I got the ok we were off! Lucky me (and him), turned out after a few 'hated it' rides he decided he loved it.....singing and playing when he wasn't busy sleeping.
Be careful if/when you do use a helmet when putting it on, even with a 'pinch-guard' buckle it is possible to pinch.

[singletrackmind]

And I just realized I didn't say...

Congratulations!