human
I've heard that there are a number of different types of stutters. What are the most common types?
assistant
The most common types of stutters are developmental, speech sound disorder (SSD), and articulation. Developmental stuttering is typically associated with children who begin to stutter between the ages of two and six years old. Speech sound disorder (SSD) is characterized by difficulty producing certain sounds or syllables, such as "r" and "l." Articulation refers to the ability to produce specific sounds correctly.