Lung ultrasound (US) is a simple and inexpensive technique for assessing community-acquired pneumonia (CAP). It has no radiation hazards and is easy to use. The aim of this study is to evaluate the efficacy of lung ultrasound in the diagnosis and follow-up of CAP. Also, the effectiveness of LUS is compared to that of CXR in patients. 100 patients aged from 1 month to less than 18 years were admitted to J.K. Lon Hospital, Jaipur with pictures of CAP. Lung US was performed for all patients initially, then a plain chest X-ray (CXR) was performed. Another lung ultrasound was performed on the 3rd and 5th day after admission. In our study a significant correlation between PRESS score and USG was found on admission (r=0.42), and on final day (r=0.43) which were significant at 0.001 level. A significant correlation between CXR and PRESS score was found on admission (r=0.23) and on final day (r=0.27), which were significant. A significant correlation was also found between CXR and USG on day1 (r=0.77), and on final day (r=0.66) which were significant at 0.001 level. These results showed that all three PRESS score, LUS, CXR were helpful in follow-up of CAP patients. Correlation between USG and CXR were more significant and helpful in diagnosis and follow-up of CAP patients. This study concluded that LUS is a better modility than CXR in identifying pneumonia in children. It is a promising tool for the follow up of patients with pneumonia.