Contemporary understanding of children as "social actors" leads to an increasing involvement of children in scientific researches. The area of early and preschool education emphasizes the importance of the Ethical Code of Research for Children (2003) as an important starting point for promoting principles and values, aimed primarily for the benefits and protection of children. Increasing interest and carrying out research with children leads to ethical questions that are challenging for all researchers, as well as educators. The aim of the research was to examine the attitudes of those who are preparing for the profession of the educator. The study was conducted with five students of the Early Childhood and Preschool Education at the Faculty of Teacher Education of the University of Zagreb, who were discussing the interpretation and application of the Ethics Code of Research for Children and the possible ethical questions that are encountered in scientific research with children. For the purposes of research, it was used the method of half-structured interviews on their attitudes in the interpretation and application of the Ethical Code of Research for Children and the possible ethical questions in scientific research. The results of the research showed a positive attitude of students towards the Code of Ethics for Children Research. They consider Code as important segment in every profession or scientific discipline, as well as in in the educational system since the child's earliest age. The main role of the Code is to provide guidance on the implementation of research involving or involving children, while protecting the wellbeing, rights and status of children. Preschool institutions should be places that support the Code of Ethics for child research and its proper application. Scientific research with children must preserve the well-being of the child, but it may happen that they are set up to bring this benefit into question, rather than cause a negative impact on the child. The wellbeing of a child in scientific research is primarily in acquiring new knowledge and enhancing practical work, and the negative impact is recognizable in the violation of children's rights and their status, minor or greater manipulation and exposure of children. Students in this paper under ethical questionnaire in scientific research with children state: violation of children's rights, consent and refusal of children to participate, manipulation, competence and objectivity of researcher, type of research, parent status and relationship between adult and child power.