Barito Kuala is one of the regencies in South Kalimantan with the highest prevalence of underweight with a percentage of 20.7%. In 2017, malnutrition occurred in Alalak District as many as 374 children under five (30.6%) with the highest nutritional status, namely in Beringin Village as many as 57 toddlers (16%). Research aim to explain the relationship between risk factors and nutritional status of childrenin the Posyandu of Beringin Village, Alalak Sub-District, Barito Kuala District. This study used an observational method with cross-sectional design. The sample was 98 respondents with proportional random sampling. Data were analyzed using chi square and Fisher exact test for bivariate, and logistic regression test for multivariate. The results showed that there was a relationship between maternal nutritional knowledge (p-value 0.043) and feeding practices (p-value 0.0001) with the nutritional status of children, while the gender factor (p-value 0.873), the age of the toddler (p-value 0.570), infectious disease (p-value 0.105), the last education of the mother (p-value 0.182), father's last education (p-value 0.290), family income (p-value 0.790), and number of children (p-value 1.000) showed is no relationship with nutritional status of children under five. Multivariate results showed that the most dominant feeding practice was related to p-value 0.001 and the PR value is 5.875 times the impact on nutritional status.