Abstract" Ninety-five infants ranging in age from one to 30 months were visited in their
homes and their spontaneously uttered speech sounds were recorded in the International …

Curves and equations were derived from data on the frequency of sound production of
infants under 2.5 years of age. The curves are linear for the first 1.5 years, and thereafter …

In the more important studies of infant speech there does not exist a large body of data
secured from adequate samplings of infants for purposes of a statistical analysis." Usually no …

The study of speeeh development during infancy is of tremendous importance for the·
clarifying of human development from three points of view. 1. Infancy is the prelinguistic …

The purpose of this article is to report an analysis of three aspects of infant speech, namely,
the syllabic structure, the phonetic structure and the vowel and consonant composition of …

IN PREVIOUS REPORTS (5, Z) analyses of the speech sound status of infants have been
made in terms of age norms. The problem of sex differences also was reported (5, 2). A …

The criteria of speech development, which will be used here, are two:(1) phoneme type, and
(2) phoneme frequency. There are others, of course, but this report will be limited to these t …

GESELL, IN HIS study of the development of the infant and child (2), has not always
confined his analysis to tabulation of details alone, but has attempted to give a dynamic and …

Abstract (A review of 92 references.) In the last few years there has been a falling off in
biographical reports and an increasing number of studies on groups of children under …

Percentages computed on the basis of different words used show somewhat greater age
changes, although the findings for all groups combined are very close to those of Zyve (5) for …