This paper arises from a clinical, observational, longitudinal study of aggression in normal children in the first two years of life. In this study of one of the research children the authors seek to delinate how the emergence and vicissitudes of aggression in a little boy are affected by a variety of strains in the course of his early development and how the aggression affects all the major developmental tasks in his young life. In particular, the authors attempt to follow the interdependent currents of object relations, aggression, and early sexual development.