Topeak Babyseat II

This one carries a child of up to 50 pounds in the rear of the bicycle, and comes included with the proper Topeak Explorer rack to mount the childseat. It's got suspension built in, as well as a padded harness and adjustable foot straps (not all children have the same length legs, after all!) This will go on any bike that has rear rack mounts. A version for bikes with disc brakes is also available, for an additional $20.