Freud traces out the commencement of the infantile attachment for the parents in this wise. In the beginning the child derives its first satisfaction and pleasure from the mother in the form of nutrition and care for its wants. In this first act of suckling Freud sees already a kind of sexual pleasure, for he apparently identifies the pleasure principle and the sexual instinct and considers that the former is primarily rooted in the latter. At this early time commence such various infantile actions unconnected with nutrition as thumbsucking, various movements of the body as rubbing, boring, pulling and other manifestations of a definite interest in its own body, a delight in nakedness, the pleasure exhibited in inflicting pain on some object and its opposite, the pleasure from receiving pain. All of these afford the child pleasure and satisfaction, and because they seem analogous to certain perversions in adults they are called by Freud the “polymorphous perverse sexuality” of childhood. The character of these instinctive actions which have nothing to do with any other person, and through which the child attains pleasure from its own body, caused Freud to term this phase of life as autoerotic after Havelock Ellis. However, with the growth of the child there is a parallel development of the psychic elements of its sexual nature and now the mother, the original object of its love, primarily determined by its helplessness and need, acquires a new valuation. The beginnings of the need for a love object to satisfy the craving or libido of the child are early in evidence and, following along sex lines in general, the little son prefers the mother and the daughter the father after the usual preference of the parents. At this early time children feel deeply the enormous importance of their parents and their entire world is bounded by the family circle. All the elements of the ego which the child possesses have now become manifest; love, jealousy, curiosity, hate, etc., and those instincts are directed in the greatest degree towards the objects of their libido, namely the parents. With the growing ego of the child there is a development of strong wishes and desires demanding satisfaction which can only be gratified by the mother; therefore there is aroused in the small son the feeling of jealousy and anger towards the father in whom he sees a rival for the affection of the mother and whom he would like to replace. This desire in the soul of the child Freud calls the _Oedipus complex_ in recognition of its analogy to the tragedy of King Oedipus who was drawn by his fate to kill his father and win his mother for a wife. Freud presents this as the _nuclear complex_ of every neurosis.