Objective: to construct a mobile application in the mobile-learning format that favors learning, offering support to the nurse’s clinical reasoning and decision-making in the prevention of adverse events related to the peripherally inserted central catheter in pediatrics. Method: the construction of the mobile-learning technological production took place between 2016 and 2020, following seven steps that included the Contextualized Instructional Designer. The content of the application was based on current scientific evidence, with the inclusion of guidelines, international and national directives; and was elaborated grounded on Problem-Based Learning. The project team involved the participation of two content experts, a programmer, and two graphic designers. Results: the application consists of a pediatric clinical case, which gives rise to six other cases, exploring six catheter maintenance procedure. When presenting the cases, the user is encouraged to perform a clinical evaluation and make a decision about the problem raised. So, when the user correctly chooses the clinical issue, there is a message of congratulations and they are encouraged to continue their learning. In opposition, when the user answers incorrectly, the software shows the adverse event that can affect the patient and a new evaluation and decision-making are encouraged. At the end of each procedure, there is an animation of the correct technique for better assimilation of the constructed knowledge. Conclusion: this type of mobile-learning application allows for knowledge dissemination and assists safe care to children using the peripherally inserted central catheters.