The media greatly influence the accelerated changes in today’s world and way of life. With its constant development, it also profoundly and inevitably affects the development of children. The purpose of this work is to investigate how changes in technology and the availability of media affect the cognitive, socio-emotional, speech-language and motor development of children, also focusing on the ways in which an adequate use of media would enable children to develop critical awareness, media competence and literacy. The research presented in this paper was conducted from January to April 2023, in cooperation with parents and guardians of eight educational groups of the Pula Kindergarten. The study was conducted using an anonymous, online questionnaire and submit the following data: the amount of time children spend using media, the types of electronic media they use, the content and applications they are exposed to, the changes perceived in their behaviour after using the media, the influence of media on sleep habits and its speech - language development. The data analysis confirmed the hypotheses about the excessive use of media by children, their exposure to inappropriate content and its consequent negative impact on behaviour. It also refuted the alleged impact of media on speech and language development and the insufficient knowledge of parents about the negative impact of media on children. The data shows a high correlation between the level of education of the parents and the amount of time the children are allowed to use media, the age of the parents, the applications used by children, and the behaviour observed after using the media. The results of this research are useful for all parents, educators and experts who already work and for students who will work with preschool children, in order to make them aware of the importance of their own media literacy and the media education conveyed to children.