We're currently waiting for an appointment with a speechy too. My son repeats the words, like "[name] [name] [name] go outside" (rather than stuttering a syllable). 5% of kids develop dysfluency, and 80% of those kids do NOT go on to stutter. That's what the info from the Royal Children's (Melbourne) says anyway It's quite common, especially at stressful times or times when they've learned a lot but don't quite have the language to express it.

As PPs have said - early intervention is key, before school is ideal. You could google Brenda Carey - she's a speech therapist who specialises in this area and her website (I don't think I can link to it here?) had some helpful things that I appreciated.

Good luck with your appointment - I can't wait for ours either, even though some days it's like it's not there at all.