Vowel formant frequencies for oneyear-old children

The main problem in the analysis of vowel formant frequencies, spoken by children under the age of one year, is that the physical dimensions of the vocal tract in children of this age are not known. For that child's age, it is better to analyze the maximal vowel spaces (MVS). For the calculation of MVS, it is necessary to know the physical dimensions of the vocal tract. MVS can be used for early diagnosis of untypical children speech. This method of early screening process is suitable because it is not based on a “stimulus-response” what is inappropriate for children of this age. If this screening method is combined with an analysis of the chronology of the adoption of certain sounds, we can get a more complete and precise evaluation child's language development at an early stage of development.