In this article the authors examine the phenomenon of creation of “childhood” and the role played by law, particularly by “puttng aside” young people with regard to their legal status. By carefully examining the evolution of Manitoba laws concerning youth between 1870 and 1924, one notices the gradual development of a specific legal space characterized by the necessity of adult control, residential fixation, moralization and interdiction for young people to be in certain public places. Putting this specific legal space Unto place was accomplished actualized by: 1) the development of new legal principles 2) the adoption of new legal designations to situations that require intervention, 3) the implementation of specific administrative structures underlying the application of this new youth legal system, 4) and the creation of a youth police. The impact of this creation is important: the transformation of the representation of youth; transformation of legal relations between children, parents and the State; global modification of the way of life of young people. But furthermore, the construction of “childhood” across the Manitoban legal system shows the transformation of necessities linked to the maintenance of a specific legal order.