Objectives: First aid programmes should include not only the transfer of knowledge and skills but also improve participants' helping attitudes. The aim of this study was to evalute the immediate and long-term effects of a 3-day first aid programme for kindergarten children. Methods: One hundred and eighteen kindergarten children (5--7 years old) from an inner-city kindergarten located in Pécs, Hungary, were involved in this study between January 2016 and June 2017. Training consisted of three 45-minute sessions involving the transfer of theoretical knowledge and practical skills about first aid. Knowledge, skills and attitudes were assessed by means of a questionnaire developed for the study and through observation. Participants were tested before and immediately after the programme and at 4 and 15 months. Results: The majority of children had no prior knowledge in first aid. Knowledge and skills significantly improved immediately after training and remained significantly higher at 4 and 15 months when compared to baseline -- calling the ambulance (p < 0.01), performing cardiopulmonary resuscitation (CPR; p < .01), using an automated external defibrillator (AED; p < .01), handling an unconscious patient (p < .01) and managing bleeding (p < .01). Attitudes towards first aid improved significantly after the programme (p < .01) and remained improved after 4 and 15 months when compared to baseline (p < .01). Conclusion: Beginning first aid education in kindergarten can be useful. Children cannot become professional bystanders immediately following training, but the programme can offer an introduction of first aid. However, the results decreased substantially after 15 months so regular refreshing training should be recommended.