Originally Posted by Roody
Maybe not mountain biking or hopping curbs, but why would a trailer on smooth pavement shake a baby?
Well, it's not the smooth pavement that is the problem. You just have to be careful about potholes, curbs, etc.
I started carting my daughter at 8 months or so (I lived in the US and had a car, so it wasn't out of necessity), but I know people here (Denmark) who just drop the baby carrier in a trailer and off they go. Lots of bike mounted seats with kids, as well. If you have the money, get one of these:
http://www.christianiabikes.com/imag...groceries_.jpg
Drop the baby carrier in and you're all set.