Stuttering is a speech disorder in which a person repeats words or parts of certain words when trying to talk. Stuttering may affect anyone at any age, but it is most common in kids ages 2 to 5. A child who stutters can have a hard time communicating with others and may become frustrated. While stuttering, a child may also blink rapidly or have trembling lips. Stuttering may be mild or severe. Certain speaking or singing activities may make the stutter worse or better. Follow the links below to find WebMD's comprehensive coverage about how stuttering occurs, how to treat it, and much more.