While the last answer was a good idea, REI is not a bike shop; so it is usually not a good place to buy cycling stuff- even trailers. However, Chariot trailers are very good trailers. One thing to consider is that a lot of trailers on the market are ...
The concern isn't so much the upright position, its the constant bouncing/movement of the trailer behind the bike. Putting a child who is unable to support their head fully into a bike trailer can cause serious problems to the child. However, most of...
Unfortunately, 26" is the wheel size and it has nothing to do with the size of the bike. A 24" wheeled bike will be WAAY too small for your wife. I strongly recommend that you go to a local bike shop and look at bikes with a 14" or 16" frame and 26" ...