Abstract : The prevalence of malnutrition is still a significant worldwide problem. WHO states that 45% of child deaths worldwide are related to undernutrition. The study aims to know the prevalence of underweight, stunted, and wasted and the risk factors that influence it in infants under six months. The study method is a cross-sectional analysis of infant nutritional status parameters in healthy infants under six months. The study was established at 10 Community Health Centers in Banjarbaru, South Kalimantan, Indonesia, from June 2020 to June 2021. This study recruited 423 healthy infants, 223 (52.7%) boys and 200 (47.3%) girls aged 1-6 months. The prevalence of underweight, stunted, and wasted were 0.9%, 0.5%, and 13.5%, respectively. There is a significant relationship between maternal age and infant nutritional status based on BMI for age (p=0.025). There is a significant relationship between maternal education and infant nutritional status based on weight for length (p<0.05). There is a significant relationship between maternal occupation and infant nutritional status based on weight for length and body mass index (BMI) for age (p<0.05). There is a significant relationship between family income and infant nutritional status based on weight for age and weight for length (p<0.05). There is no association between infant nutritional status, maternal parity, and exclusive breastfeeding practices. Conclusions: There is a significant relationship between maternal education, maternal occupation, and family income with undernutrition in infants under six months.