Nutritional adequacy of pregnant women will affect the nutritional status of their children, especially in their “golden age”. The objective of this study was to determine the associated factors that influence the incidence of stunting in children of 12 months old, to compare the hazard ratio of the occurrence of stunting, and to determine the most important factors that associated the incidence of stunting in children aged 12 months old. This was a longitudinal study. The samples include 262 pregnant women with gestational age between 12-16 weeks who were subsequently followed-up until their babies were 12 months old. Data were collected from March 2011 until December 2012. Data included maternal education, food consumption recall of pregnant women, and the nutritional status of children aged 12 months old. The statistical analysis used was descriptive analysis, Kaplan Meier, and COX Regression. Babies born from mothers who had less than 58 percent RDA protein intake in their second trimester of pregnancy had 1.6 times more risk to develop stunting at 12 months old compared to those born from mothers who had 58 % RDA or more protein intake during their second trimester of pregnancy. Also, children who were born with body length < 48 cm had 5.9 times more risk to develop stunting at 12 months old compared to those born with body length ≥ 48 cm. The protein intake of pregnant mothers at second trimester and body length of child at birth could influence the occurrence of stunting in their children at 12 months old.