Be careful with helmets.org, though, because if you read enough it might convince you that you should never get on a bike yourself, much less let your kid ride on or behind one.

We have a regular Chariot trailer and we started her around six months, no helmet, trails only, and she hated it until about eight months. We did not push it until she started to like it. Actually we took a break after our first attempts and waited until she was sitting very solidly upright on her own, and I think that helped. She is very small for her age so we use the infant insert for the Chariot.

She's a year old now and we've just started using a helmet (and riding on the road as well as trails). She loves it.

We have friends who put their kids in much younger than six months, and others who waited until a year. The one thing that has been pretty universal is that nobody uses a helmet until one year ... the trailers are very safe, but a helmet, ironically, is not safe for a baby's neck until about a year.

Some people also put a carseat in the trailer, but that isn't going to work with a Chariot unless the sidecar is much bigger than the trailer. There just is not enough room.