[Disturbances of mental development in infants and preschool children. Their recognition and treatment (author's transl)].

After a short introduction setting out the importance of development dimensions for the understanding of disturbances of development and some statistics on the frequency of peculiarities of behavior in the preschool age, some disorders of mental development of practical importance in the first years of life are dealt with. Psychomotor disturbances, disorders of speech and speaking and emotional and contact disturbances are emphasized.