Stunting reflect chronic nutrition problem especially in the first 1000 days live that cause growth and development disruption in toddler. During 2018 there are up to 4907 (48,4%) toddlers who suffer from stunting were identified in South Aceh. Stunting are influenced by some factors such as mother's education level, social and economical status, low birth weight babies, immunization status, mothers body height, mothers age, toddler infection diseases history, maternal health status and environmental sanitation. The purpose of this study is to find out risk factors of stunting incidents in work area of implementation unit of South Aceh Regency health primary services. The type of this study is quantitative with descriptive correlational study and designed with cross sectional study. Population of the study is whole 408 of 1-5 years old toddlers and 301 of them are taken total sample based on inclusion criteria. The measuring instrument was the questionnaire modification of the Indonesian Health Ministry. Stampede scales are GEA BR90158 and microtoise SH-2A GEA to measure toddler anthropometric. Result from logistic regression shows that low birth weight babies are significantly related to stunting incidents (p=0,000) by odds ratio 6,021, infection disease history (p=0,003) by odds ratio 2,292 and environmental sanitation (p=0,026) by odds ratio 1,800. Low birth weight babies have six times possibility if compared with those who not. It is expected to family to fulfill nutrition needs, evaluate growth and development status, especially low birth weight babies, as the dominant risk factor in stunting incidents.