Objective To carry out the construction and the content validation of digital educational material in e-book format about first aid in the care of children and adolescents. Methods Quantitative methodological study, developed in two phases: the development of the digital educational material, based on updated scientific literature, aimed at laypeople, with the purpose of providing essential knowledge on Basic Life Support in urgent and emergency situations involving the pediatric population; and the content validation by a Committee of Judges, using the Educational Content Validation Instrument in Health and applying the Content Validity Index test. Results The e-book was evaluated by experts, achieving a Global Content Validity Index of 0.988, reflecting high agreement among the judges. Specifically, the Content Validity Index for the objectives of the material ranged from 0.878 to 1; in structure/presentation, the Content Validity Index reached 1; and in relevance of the content, the Content Validity Index was 0.878. Conclusion The e-book Primeiros Socorros: no cuidado de crianças e adolescentes has proven to be an effective and validated educational resource and has included updated content on emergency situations involving children and adolescents, providing Basic Life Support guidance, and improving the health literacy of lay people. Content validation confirms its suitability and effectiveness in meeting the proposed educational objectives, as well as its relevance and presentation.