The aim of this study was to investigate the characteristic of information sufficiency in speech of children during their second year of life. We tried to select those elements of child's speech which have the main meaning in successive recognition of the sense of child's utterances by adults. The vocal phonemes from child's words and syllabic structure of words in child's utterances, were quite successfully recognized. Unclear articulated consonant's phonemes caused mistakes in recognition. Auditors with professional experience of analysis of child's sounds described the phoneme consequences of child's signals and the scence of child's words more clearly.