Estimated Fetal Weight is one way to monitor the growth of the fetus in the womb. Along with the development of technology, the use of Android can be used as a medium for health educational information. The purpose of this study was to analyze the effect of using the Fetal Weight Estimation Android Application (Si-RAJA) on the knowledge of midwives in monitoring fetal growth. This study used a quasi-experimental method with one group pre-test-post-test design for 30 midwives who were taken using a proportionate stratified random sampling technique. Data were collected from September to October 2021 at Puskesmas throughout Tanjungpinang City. Data analysis used dependent samples t-test. The results showed that the mean knowledge of the estimated fetal weight increased from 69 (Pre-Test) to 78 (Post-Test). There is a significant difference in knowledge before and after using the Si-RAJA android application with a p-value of 0.000. Midwives show satisfaction with the use of the Si-RAJA application and the Si-RAJA application can also increase the knowledge of midwives in monitoring fetal growth.
                        
                        
                        
                        
                            
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