OBJECTIVES: to develop a mobile application for first aid to children, designed for use by basic education professionals. METHODS: we carried out this applied research in three phases: 1-integrative review, 2- identification of learning needs through a cross-sectional study with 53 school professionals, and 3- app development. RESULTS: the Child and Care (Criança e Cuidado) app includes three main sections (Important contacts, Learn first aid, and Record the accident). It incorporates multimedia resources such as videos and images to inform users about first aid in the school environment and allows accident logging. CONCLUSIONS: this mobile app is a technological educational tool that, after validation, will disseminate crucial information to protect children's health and safety. It is an initiative to prevent unintentional injuries and provide a strategy for expanding the role of nurses by integrating health and education.