In the environment where it was selected, the human typical attachment must have conferred advantages of survival the individuals, in such way that it finished being molded genetically in the species. The function of the attachment has been thought about terms of the protection of predators, of offers of cares proportional to the level of immaturity and dependence of the babies and the guarantee of systematic convivncia with representative adults of one determined culture, essential to the cultural evolution human being. Chapter 2 the FORMATION OF the AFFECTIVE BOND the behavior human being could better be understood from the application of the Etolgicas Theories, that had translated the concepts evolucionistas biological in behavior terms. When John Bowlby, English psychiatrist, studied the bond between mother and son, concluded that this linking was part of a behavior system that served to the protection of the species, since the human babies are defenseless and incapable to survive alone for a long period of time. In this way, the attachment of the babies to its mothers or cuidadores, is what it would make possible the survival of the species. Amongst the many contributions that the research in etologia had brought to the study of the human development, one of them was of that in some periods of the life, the individuals are more citizens to be influenced for definitive facts, that in others. Many scholars believe that the formation of the bond of attachment starts before exactly of the birth of the baby. He knows yourself that before the conception and during the gestation, factors exist influencing the formation of the bond, as for example: – The unconscious desire of the parents with regard to the development of its mother and father papers; – The existence of the baby while possibility; – The quality of the relation of the proper couple. 2.1 The sprouting of the attachment Was Bowlby the first one to deal with the subject attachment and bond.