ABSTRACT Background: Malnutrition has become an urgent global health problem. Millions of people are killed or disabled every year due to insufficient nutrition. Indirectly influenced by upbringing, food availability, socio-economic, cultural, and environmental factors. Based on the regency, the highest percentage is in West Sumba (12.20%). This study aimed to find out the factors related to malnutrition events in under-five children in Kabukarudi village, East Nusa Tenggara. Subjects and Method: This was a cross sectional study conducted in Kabukarudi Village, Lamboya District, West Sumba Regency, East Nusa Tenggara. A sample of 99 was selected by purporsive sampling. The data was analyzed by chi square. Results: Relationship between knowledge level (p = 0.047), type of foodstuff (p <0.001), and infectious diseases (p <0.001) it was statistically significant. Conclusion: Malnutrition events in under-five children is associated with knowledge level about nutrition, type of food consumed and infectious disease. Keywords: malnutrition, knowledge, food variant, infection desease Correspondence: Theresia Puspitawati. Public Health Study Program, Faculty of Health Sciences, Universitas Respati Yogyakarta. Jl. Laksda Adisucipto KM.6,3, Ambarukmo, Caturtunggal, Sleman distric, Yogyakarta 55281 E-mail: [email protected]. Mobile: +628122719110. DOI: https://doi.org/10.26911/the7thicph.01.21