Recognizing the importance of assessing the risk of antisocial behavior, this study aimed to characterize the risk factors for the occurrence of antisocial behavior, seeking to understand if there are differences between boys and girls. Eighty-five cases of children referred by the promotion and protection system due to the display of antisocial behaviors were reviewed. A total of 65 were boys and 20 were girls, aged between six and eleven years. Data collection was performed using the Portuguese version of the risk assessment instruments Early Assessment Risk List for boys and for girls. Gender differences were assessed, with boys exhibiting a higher risk level for antisocial behavior, adopting more serious behaviors (e.g., impulsive behaviors). Girls engaged in less serious behavior (e.g., disrespect). By characterizing the most prevalent risk factors, the results of this study may contribute to the identification of intervention priorities.