Diarrhoea is a health problem that is often experienced by infants and toddlers and in almost every country. One of the efforts to prevent diarrhoea was through counselling. Due to the pandemic situation, face-to-face counselling was not possible. This study aimed to assess the use of e-learning in increasing knowledge, attitudes, and behaviours to prevent diarrhoea. This research was an analytical observational study with the design of The One Group Pre-test Post-test Design. Samples were select used the purposive sampling technique. The sample size in this study was 54 students. The eLearning model used in this research was Google Class. The data were obtained by using google form then analyzed using McNemar Test. The results of the analysis showed that there were differences in knowledge (p-value = 0.000), attitudes (p-value = 0.031), and behaviour (p-value = 0.016) to prevent diarrhea before and after treatment. The utilization of online learning (e-learning) significantly affected increasing knowledge, attitudes, and behaviour in preventing diarrhea. In the future, e-learning can be an alternative to prevent diarrhea during a pandemic.