It is considered that preschool age is a time of intensive child development where children get to know their environment, but also socially acceptable norms. It is a period in which a series of changes takes place under the influence of the environment and heredity. In children's growing up, situations sometimes occur in which there are deviations in children's behavior and what is considered socially acceptable. The appearance of aggressive behavior in children is one of the socially unacceptable patterns of behavior. Aggression has become a bigger and more common behavior problem that appears from an early age. This work provides a definition of aggressiveness, explained theories and subtypes of aggressiveness, and risk factors for the appearance of aggressive behavior. The paper presents methods of prevention and intervention, as well as treatments that can be used to help with problematic behavior. An insight into the difference between the sexes in the appearance of aggressive behavior was also made and shows the presence of aggression in the kindergarten and family environment. The paper also looks at the influence of parenting styles and mass media on the appearance of problematic behavior. A child monitoring protocol was created for the purpose of research in a specific example of why problematic behavior occurred and how to intervene. The aim of this paper is to explain the concept of aggressiveness, to determine the risk factors for the occurrence of problematic behavior, and how we as a society can influence these factors in order to reduce the occurrence of antisocial and aggressive behavior in children.