Incidence, causes and symptoms of retarded development of speech were studied in 1114 children just three years old living in Matsumoto City, and the following results were obtained:
(1) Out of a total of 1114 children,
Congenital deafness 1 case
Mental defficiency without hearing
impairment and suspicious cases 6 cases
Cerebral palsy 2 cases
Retarded development of speech without
mental defficiency as well as hearing
impairment 30 cases
Stuttering 13 cases
(2) Children of low birth weight were found more frequently in the group of retarded develop- ment of speech than in the normal group, and this was statistically significant.
(3) Neonatal asphyxia was also significantly frequent in the group of retarded development of speech.
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