what size did you start out with? 12" or 16" for your kiddos? this will be a birthday present for my DD, she is rather on the petite side, but we don''t want to go "bike" shopping because then she''ll talk non stop about one and go nuts over it. Also where did you buy from? any recommendations? I found a huffy and a kids R Us brand. Rayleye (something not sure if I spelled that right)