Introduction.

The disfluency is an involuntary disturbance of fluency when speaking. It is characterized by the repetition of sounds, syllables, words or long breaks. It is also refered to a motor deficit, defining it as a difficulty in the motor planning, due to time lag of the speech mechanism.

Methodology.

A bibliographic search is carried out about physiological disfluencies in preschool age and its differential diagnosis with dysphemia in various scientific databases.

Development.

They were revised 442 titles, 41 of them met the selection criteria. It must be taken into account an important aspect that the small children when they begin to develop the language, they present this speech disorder.

Discussion and conclusions.

The stuttering remains a highly researched topic so that it has been found a variety of articles although many of them go in opposite direcctions. Mainly for its etiology that it is not yet know the exact cause. It usually occurs between 3 and 5 years old. They can be frequent in children that develop communicative skills but not in all cases. Therefore rarely do it get serious that would be from 1%.