Stuttering is a speech problem characterized by repetitions, pauses, or drawn out syllables, words, and phrases. Stutterers are different than people experiencing normal fluency problems because a stutterer's disfluency is more severe and consistent than that of people who do not stutter.
The following articles are provided for your reference from Super Duper Publications and other resources.
Encouraging Speech from your Dysfluent Child
What do you want to know about Stuttering
Focus on Fluency Strategies
Stuttering Strategies for Teachers