In this graduate work will be mention the basic differences between girls and boys because they are the ones that lead to the creation of gender stereotypes. Prejudices lie on stereotypes. Children from their third year ask a variety of questions to their parents, other family members, and educators. If the answers to these questions reflect prejudices, the child will accept these views of stereotypes and prejudices of the pre-school age. Studies have shown that children observe their parents as models and want to be more like them, girls want to be like their mothers, boys want to be like their fathers. By watching their models, children are exposed to stereotypes. When a child is exposed to stereotypes, prejudices may arise. It is not quite clear from where prejudices originate, but research has shown that prejudices are not inborn, but learned. Through literature, it has been studied that children have the most prejudice based on their physical appearance. The research in Croatia described in this work has shown that school children have already adopted prejudicial attitudes. These attitudes have been developed already before starting school. Prejudices in children are difficult to change because they are deeply rooted in the minds of children, but there are some procedures that can help. Experts suggest expanding education, democratic education, adopting legislation, changing perception, raising tolerance and so on. Children should be taught how to think critically, should be working on the development of tolerance, show the beauty of diversity, develop into children empathy and tolerance, then there would have to be some change. That's why parents have a big role to play, also closer family and kindergarten i.e. educators, they are the first contacts in the child's life, with their example they guide the child.