The study focuses on the fundamental problem of the reflection the functional state in the characteristics of voice and speech. The aim of the study was to determine the duration, pitch and spectral maxima in the infant‘s vocalizations in different emotional status. The work consisted of two stages: the first – involved an acoustic instrumental analysis of vocalizations, the second - per-ceptual analysis of vocalizations, reflecting the different emotional condition of the child. Acoustic spectrographic analysis was carried out in a sound editor "Cool Edit Pro 2.0". It is shown that the vocalizations reflecting the state of discomfort, characterized by longer duration, the values of the pitch and spectral peaks, and significantly different from the "calm" and "comfortable" vocaliza-tions. On the basis of perceptual analysis shows that adults are experts often include "comfortable" vocalizations of children to the correct category, if the vocalization is the duration and frequency (or CHOTA or any of the spect