It's important to know that those who stuttering are quite bright and normal in every way except their fluency. Having a little slip-up in speech is common for every speaker. Did you know we all stutter? at least 1% of everything we say.
It's when it's worse that we start to worry. Here is a good link for solid information.
/http://www.stutteringhelp.org/ I'm on their list of providers, so if you have more questions per your specific case, please call or email. I'd be glad to help. Sometime I can provide some general helps that you can do on our own to monitor your child's speech situation. Other times, you will want to come in for specific speech therapy.