DD (5, with quiet severe autism and only little speech/language) managed to get the hang of riding the bike (without stabilisers) over the summer hols. very proud 
however, she does not get the hang of stopping/breaking at all. she always stops with her feet (2 pairs of shoes ruined so far). we adjusted the break levers so she can reach them easily but I suppose it is just too much for her to coordinate.
there are some bikes out there with coaster brakes (back pedal brakes) and I wondered if this might be the way to go 
anybody had this issue and found coaster brakes are the solution?