This research brief overviews a study by Andrei Cimpian and his colleagues, exploring the development of stereotypes about intelligence. The research team conducted multiple studies to assess the developmental trajectory of the endorsement of gender stereotypes among young children between the ages of 5 and 7. They found that by the age of 6, girls were less likely than boys to believe that members of their gender are “really, really smart” and were less likely to participate in activities labeled for children that were very smart.