The scientific knowledge about how sport are adapted to the child’s preferences, needs and circumstances in different sports is flawed. It also means that the knowledge of the effects of alternative models for children’s sport are largely missing. The purpose of this study was to analyse how sport organizations within the Swedish sport system works to adapt sports and sport-practices to suite children better – and how the goals based on the visons of sport federations were implemented in the practice of children’s sport in sport clubs. Further, the aim was to investigate how coaches and children in sport clubs experienced the adaptions of sports initiated by sport federations. The research was inspired by a system theoretical approach and conducted within a qualitative framework. The empirical data was derived from semi-structured interviews with 31 people from the sports basketball, floorball and track-and-field. The sample consists of seven sport federation representatives (national and regional level), 12 sport-club coaches and 12 children between 10 and 13 years. The results indicated that the examined sport activities were experienced to be relatively well adapted to the children, however there are still much that needs to be changed. Furthermore, the results showed that national sports federations applied different strategies for implementation of the adaptions of the sport and sport-practices to children at the sports club level. The different strategies were; the governing strategy (basketball), the testing strategy (floorball) and the education strategy (track and field). Overall, this study contributes to a deeper understanding of possibilities and difficulties for sport organizers to develop children’s sport in accordance with a child perspective and of the meaning of cooperation within the Swedish sport system to implement visions and policies at club level.