The mother nutritional needs during pregnancy must be met properly, because the fetal nutrition depends on the nutrition of the mother. Based on the results of Riskesdas in 2013 obtained that the proportion of pregnant women aged 15-49 years who are at risk in experiencing chronic energy lack in Indonesia were 24.2% and in Bali were 10.1%.The incidence of pregnant women with chronic energy lack is influenced by various factors that are closely related to the behavior of pregnant women to fulfill their nutrition. There are three factors that affect behavior, namely predisposing factors or factors that facilitate (Predisposing Factor), Supporting Factors (Enabling Factor) and Driving Factors (Reinforcing Factor). The purpose of this study was to determine the factors that influence the behavior of pregnant women in the fulfillment of the nutrition. This study employed descriptive design with cross-sectional approach. There were 99 respondents recruited in this study by using nonprobability sampling. The data were collected by using questionnaire. The finding of this study showed that factors that influence the behavior of pregnant women in the fulfillment of nutrition were age (value p = 0.020), education (value p<0.001), attitude (value p<0.001), and family support (value p<0.001). While parity (value p = 0.082) and knowledge (value p = 0.226) did not affect the behavior of pregnant women in the fulfillmen of the nutrition. Maintaining pregnancy is important to detect the growth and development of the baby in the womb. The mother should pay attention to the nutrients consumed during pregnancy.