for the longest time, quentin would count, "one, two, nine, ten, eleven, twelve..." sometimes we would add in 5, 6, 7, and/or 8, but 3 and 4 were never part of his number set. but over the past few days, they have been added and he now consistently counts to 13 correctly. i think he thinks he's counting to 15 though, because he repeats 13 three times.