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Small for gestational age (SGA) infants is one of the unfavorable outcomes of pregnancy that needs to be prevented. There are not many studies available on the association of maternal vitamin D levels during pregnancy and SGA infants. This study aimed to discover the association between maternal vitamin D level and SGA infants in West Java. A cohort study was performed from February 2018 to January 2019 by recruiting 304 pregnant women in Bandung, Cimahi, Waled, and Sukabumi, West Java Province, Indonesia. Of that number, 203 women were followed until the delivery date. Data were collected from the results of serial ultrasonography examinations and maternal vitamin D level measurements. Bivariate analysis and logistic regression were then performed to determine the relationship between variables. This study showed that 30 of 203 (14.78%) infants were born as SGA infants. The mothers of these SGA infants had a lower maternal vitamin D level at the beginning of the second trimester and smaller anthropometric measurements at the beginning of the third trimester. However, no significant difference was found between normal infants and SGA infants when the overall values for all trimesters were compared. It can be inferred that the maternal vitamin D level has a negative relationship with SGA infants in West Java, Indonesia. Further studies are required to prove the relationship between maternal vitamin Dl level and SGA infants.