This article is devoted to analysis of the predictors of the "3 years old childrs crisis" in the field of parent-child interaction (parenting styles, peculiarities of emotional interaction mothers with children, characteristics of family adaptation and cohesion). The study involved 117 children (65 boys and 52 girls) and 117 their mothers from Vsevolozhsk district of the Leningrad region. The age of children - from 2 years 1 month to 3 years 11 month, Mage = 3 years. We used psychodiagnostic methods and the method of observation. The study revealed that the period from 2 years 1 month to 2 years 9 months is characterized by signs of subcritical phase, critical phase was observed after 2 years 10 months. "3 year old childrs crisis" is more pronounced at lower emotional acceptance of the child, maternal educational uncertainty, underdevelopment of parental feelings, indulgence overprotection, immaturity of maternal emotional behavior in actual interaction of mothers with children. At the same time the crisis manifestations can be expressed in the case of well-being in family functioning and emotional interaction (family cohesion, the sensitivity of the mother to child), which confirms the normativity of the "3 years old childrs crisis".