The relevance of the study provided results from the need to search for the objectifying methods to assess self-identification phenomenon in early childhood. The study aimed to evaluate the diagnostic potential of the software-hardware complex for analysis of self-identification phenomenon in young children. The sample consisted of 136 subjects of early age (12–36 months): 57 boys and 79 girls. Assessment methods: functional neuropsychological tests for evaluation of facial and optical-spatial gnosis; test 22 — mirror image series of the Bayley-III cognitive scale; self-recognition mirror test; the developed software-hardware complex for analysis of self-identification phenomenon in early childhood (SHC). The study conducted has shown that self-identification emerges at the age of 18 months, which has been also confirmed by the earlier research. However, the response to one’s own reflection in the mirror as one sign of self-identification manifests itself in children at an earlier age and in some children turns out to be shaped by the age of 12 months, which is suggested by the facts of successful test execution in the group aged 12–17 months and low specificity of the method for self-identification. Thus, high SHC specificity for self-identification in early childhood is reported based on the findings.