It's not unusual at all. Repetitions are better than blocking. It shows he's still trying to get the word out instead of holding back so much he's not even willing to make sound. One thing you should know is stuttering is very different and the therapy is very different from other speech disorders. It's the condition speech therapists have the least experience in and the least confidence in, so don't necessarily think you'll get him in to see the first therapist and she'll be able to help. It really takes someone not only trained in stuttering, but also someone who gets it and knows how to help. I would avoid "practicing" fluency or bringing it up (fluency, not stuttering). If your son has a stutter, that's going to be part of who he is and working for fluency will be asking him to try and achieve something he can't do and that feels very bad, like there's something wrong with him. If he ends up growing out of it or it lessening with age, that'll happen as it happens. There's no surefire way to know to ensure this, although I'd say focusing on fluency tends to make it less likely by making one more self conscious of stuttering, not less. You want him to know there's nothing wrong with him or with stuttering, it's just a different way of talking. I'd be willing to bet fluency isn't your goal. Him being happy, being able to make friends, express himself, get a job, be confident is what you want for him. He can be all that and still stutter. You should be patient with him when he's stuttering, give him time and space to express himself. Try and make him feel comfortable so that he doesn't feel the need to panic and get words out as quickly as he can. This is really where a qualified SLP who gets stuttering helps. Other than that, we've all been told to slow down, think about what you want to say, etc. and it doesn't help. If you or your wife are naturally fast talkers, you could maybe slow your rates a little when speaking with him, but not abnormally slow.