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Hmm, I'd be slightly concerned about how well those brakes will work with the extra weight/momentum. Not a problem if you're always going slow I guess.
Other challenges
-if it's a rack mounted seat then it'll want P clips up top
-the hinge for folding my not play well with new twisty forces
-a normal rack will sit quite high/keep the centre of gravity a bit high. I'd look for a rack that's designed for 20" wheels
-3 speed internal might not be enough gears? Although this could be a plus if it stays in first gear all the time.I'm going to put a child seat on a mini velo at some point. Similar bike, but won't fold, will have disc brakes and 10 gears.
I think the lower centre of gravity will be good for handling and getting things/people in and out of the seat.
I know nothing about child seats....
Would it be possible/sensible to fit one on a 20" wheel shopping bike, specifically one of these?
The bike is mine, the child is not...parent of child looking for a bike, I can lend her the kingpin but it's only useful to her if she can put a child seat on it. Child is about 2.