<![CDATA[Background: Mothers’ practices in feeding children under two years of age in Semarang City are suboptimal. To prevent nutritional problems, mothers need targeted education on complementary feeding. Online education was chosen because it suits urban conditions. Objectives: To analyze the effects of online education on complementary feeding provision on the weight for age (WAZ), weight for length (WLZ), and length for age (LAZ) Z-scores of children aged 6–18 months. Methods: A quasi-experimental study was conducted involving 107 mother-child pairs aged 6-18 months, divided into intervention and control groups. Education on complementary feeding was delivered via YouTube and WhatsApp groups. The dependent variables were WAZ, WLZ, and LAZ Z-scores. Nutrient intake was evaluated using a 2x24-hour dietary recall. Data analysis was performed using the chi-square tests, independent t-tests, Wilcoxon signed-rank tests, and ordinal regression. Results: There were no statistically significant differences in child, mother, or family characteristics between the intervention and control groups, except for the number of family members, which was higher in the intervention group than the control group (p = 0.04). There were no statistically significant differences in nutrient intake observed between the two groups. Following the intervention, the proportion of wasting children significantly decreased from 11.3% to 1.9% in the intervention group, but increased from 5.6% to 9.3% in the control group. There was no significant effect of online education on the WAZ and LAZ score categories. Conclusion: Online education on complementary feeding for mothers reduced the proportion of thin children aged 6-18 months.]]>
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