The qualitative composition of sounds produced by children in the first, second, and third months of life was determined. The characteristics of the most common sounds produced at these ages, among the speech-like elements were subjected to instrumental analysis. The qualitative composition of sounds were shown generally to correspond to results obtained by studies of the acoustic signals produced by children in the first months of life who developed in a non-Russian language environment. Assessment of complex signals in terms of different fragments demonstrated that the vocalizations of babies in the first months of life contained phonetic units which were not characteristic of the Russian language. Instrumental analysis of the vocalizations of babies provided evidence of both similarities and differences in the speech-like elements in terms of the acoustic characteristics of features important for their recognition as compared with similar sounds in adult speech. (PsycINFO Database Record (c) 2016 APA, all rights reserved)