Impact of MOOC-Based CME on General Practitioners’ Knowledge of Early-Life Nutrition

General practitioners (GPs) are at the forefront of stunting interventions, but only a few studies have examined their understanding of growth monitoring. Therefore, this study aims to assess the effectiveness of massive open online course (MOOC)-based Continuing Medical Education (CME) programs to increase GPs’ knowledge of nutrition and early detection of growth abnormalities. The study procedures were carried out using a pre- and post-cohort approach involving 121 GPs, mostly working in primary care in Indonesia. The pre- and post-test scores were observed before and after the 12-week MOOC intervention, and the participants were asked for feedback. There were 190 verified participants; the attrition rate was 27.4% (n = 52), and there were six participants with incomplete data, leaving 121 participants as the final sample. The results showed that post-test scores significantly increased after intervention in all domains. These domains included early-life nutrition (7.00 to 9.00), breastfeeding and lactation management (5.56 to 7.78), and feeding problems (7.33 to 8.00) (p < 0.001). Participants reported high satisfaction and preferred a combination of synchronous and asynchronous learning. The feedback suggested improving parental education techniques, specifically in low-socioeconomic settings, and strengthening collaboration between GPs and nutritionists in managing feeding problems.