The article is devoted to a father as a key agent in the system of mother support and as a significant factor of successful pregnancy adaptation and maternity identification. The concept of social maturity is offered. Complex of father’s actions to support mother’s during pregnancy, birth and upbringing a child is exposed in the article. The author concludes, that there is a substantial deficit of men’s support, differentiated depending on structural, individual and familial resources of the father. There are some types of fathers disclosed: actively assuming, passively assuming, actively refusing and passively refusing. Thus, the conclusion of multiple father’s identity is substantiated. The author distinguishes four different father’s identities regarding fatherhood (parenting, mother, child as well): negative, infantile, situational, mature. The author establishes the predominance of fathers with infantile and situational identity and offers approaches of mature and responsible fatherhood development