Optimal weight gain is a crucial indicator of a child's nutritional status. At 12 months of age, protein requirements increase to support growth, and insufficient intake can raise the risk of growth faltering. The Riau Islands Province possesses local food resources—specifically fish, such as the *dingkis* fish—that have the potential to serve as a source of animal protein for supporting child growth. This study aimed to analyze the effect of *dingkis* fish consumption on weight gain in 12-month-old children. A quasi-experimental pre-post test design was employed to evaluate weight changes before and after the *dingkis* fish intervention. The results demonstrated that the consumption of *dingkis* fish significantly increased the children's average weight by 475 grams (p = 0.001). These findings indicate that *dingkis* fish consumption influences weight gain in 12-month-old children and holds potential as a local animal protein source to support growth and prevent growth faltering
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