If aggressive behavior is not interrupted in early childhood the risk of growing up in an environment of continued physical violence increases. Thus, violent behavior can be normalized by certain children who can exert violence without any sense of responsibility. The consequences for children suffering from intimidation and violence by their peers are severe. Previous research shows that to be completely efficient, interventions that target aggressive behavior must begin when children are under the age of five. This study examined how the implementation of evidenced-based actions in Cappont Nursery (Spain), which includes children from 1 to 3 years old, is successfully preventing aggressive behaviors. Data were collected from a qualitative study based on focus groups with adults and observations with children. The results suggest that the most efficient transformative tool to treat aggressive acts is the creation of a zero-violence climate among educators, families and children.