Backboard, $90, US shipping included
 
You can swap backboards as your kid grows.  The backboard comes with the lumbar pad and is available in three heights.  The 22” includes grip material on the lumbar pad and a cross bar to minimized frame barreling.
 
Torso Size            Backboard Height
13”-18”                             18”
15”-20”                            20”
17”-22”                            22”
 
See Fitting page for measurement and fitting instructions.