Background: Increasing risks and complications with IV cannulation making this issue a research focus of several authors around the world. In addition, it was reported that emerged complications with IV cannulation could be phlebitis, infiltration, extravasation, infection, and pain. Aims of the study: This study aimed to evaluate nurses' practices during intravenous canulation for children in the emergency units.Methodology: A mixed method research design was used in this study specifically (Convergent parallel: Quantitative and qualitative approach). The study was initiated from October 15th, 2021, through June 28th, 2022. A nonprobability (Purposive) sample was selected of 25 nurses who work at Alzahraa teaching hospital. The data was collected using a previously prepared questionnaire and official agreement to use the study questionnaire was obtained from the original author. Descriptive statistics (frequencies, percentages, mean, and standard deviation) and inferential statistics (contingency coefficient) were used in the data analysis.Results: Findings declared by most of nurses that they have practice deficit about pediatric cannulation, especially at the first time of their work. Participant 7 said that "even though we got knowledge about IV cannulation during our education journey in nursing college, but it is not enough to be proficient to perform this procedure as an expert. We have limited knowledge and practices about performing procedures in pediatric patients who are different from adult patients". Conclusion:The study concluded that Several themes were emerged from nurses' responses to the main research question "What are the barriers that confronting nurses' practices during insertion of intravenous cannula to children in emergency room? The major themes were nurses' related barriers; organization's related barriers; patients' related barriers; and opportunities and solutions for barriers.Recommendations: Efforts from the ministry of Health in Iraq should be targeted toward supplying pediatric emergency nurses with all facilities that assist their work focusing on availability of IV viewer.