Malnutrition (underweight, stunting, and wasting) in infants is still common nutritional problems inIndonesia. Many factors affect infant malnutrition, including inappropriate infant feeding. Maternalsociodemographic factors are also thought to affect infant malnutrition. The objective of this studywas to analyze factors associated with the nutritional status of infants aged 6-12 months accordingmaternal sociodemoghraphic and infant feeding practice in Bogor. This study used cross-sectionaldesign with sample of 92 mothers of infants and 92 infants aged 6-12 months. Variables in thisstudy were maternal characteristics (age, education, occupation, and family economic status), infantfeeding practices (exclusive breastfeeding and formula feeding before 6 months old), and infantanthropometric (weight and height). Nutritional status was analized using WHO Anthro software.Data analysis using Chi-square test. Results showed the prevalence of underweight, stunting, andwasting was 4.3%, 13%, 9.8%, respectively. There was a significant association between maternaleducation and family economic status with infant nutritional status (HAZ and WAZ) (p <0.05). Itis necessary to improve maternal knowledge on appropriate infant feeding practice to reduce infantmalnutrition.