Hi S.,
BOTH of my boys did this around age 3. My oldest one, now 12, will still "stutter" occassionally. I asked the school to test him around 2nd grade, and they did. He had PERFECT results and found no problems at all.
What I discovered was this......when he read, he was fine. When he was repeating, he was fine. It was when his mind was in "free zone" and he could talk about anything he wanted was when he had "bumps in his words".
My youngest wanted to be like his big brother, so he began talking that way at age 3. He thought that's how you were supposed to speak.
Anyway, To sum up YEARS of having "bumps in our words" and no Speech problems (according to the pro's), we decided to make sure that EVERYONE in the house spoke slower. We parents are sometimes in a rush all the time and don't even realize that we are speaking so fast:O) My husband is the worst!
After trying very hard to always speak at a "normal" rate, the bumps have diminished. They are not gone by any means. But what I've learned, is when they are SOOOO excited about what they are trying to say...they have "bumps".
We came up with the word "bumps" because of speed bumps. The slower you go over them, the less the bump.
Be patient with your 3 yr old. He's so excited about all the things he can say, he just cannot say them fast enough :O)
I hope you can relate to something I've said in order to make the best decision for your son.
~N. :O)