Background Risk factors for stunting are not only during a child?s growth period, but also during maternal period. Pregnant mothers at high altitude could influence stunted growth to the child due to low oxygen partial pressure. Aim Observing and comparing risk factors for stunting by altitude and other contributing factors. Methods This was a cross-sectional study conducted to patients <5 years old in Ulu Pungkut highland (700 meters above sea level) and Desa Singkuang lowland (4 ? 6 meters above sea level) from March 2019. Anthropometric and oxygen partial pressure measurements were done to 38 children in the highland and 38 children in the lowland with stunted and normal growth. Results PaCO2, total CO2 and HCO3 values were significantly different among the research subjects residing in the lowland and highland (p<0.0001). There were no significant differences in oxygen partial pressure between children with stunted and normal growth. Conclusion Subjects in highland and lowland had significant differences in PaCO2, total CO2 and HCO3 between different altitudes in this study. However, oxygen partial pressure was not significantly different between stunted and normal growth children.