Morning Sifu's, am into MTB and now my wife and kids are keen to join. targeting either new Trinx or used Dahon/java bike.

yesterday was at a shop and would like to seek sifu's advice on foldies as could not understand a couple of things.

1. Are the market foldies have the same size, size refer to from seatpost to handlebar distant
2. my daughter height 4 ft, 3 inch, is there shorter seatpost for sale.
3. are there any readily available front steerer which can purchase at shorter length (to fit my daughter height).

Tks in advance for enlightment.