Introduction: Pneumonia is still a major global health issue, particularly for young people under the age of 18. This acute respiratory infection results in fluid buildup and lung inflammation, which makes breathing harder and raises the death rate for children.

Objective: Investigating the different patterns and manifestations of pneumonia in children under the age of eighteen in Dhaka, Bangladesh, was the study's goal.

Methods: This observational study was conducted at the Bangladesh Shishu Hospital and Institute, Bangladesh, over a period of one year from January 2023 to December 2023. A total of 110 participants aged 0-18 years, who visited the hospital during the study period, were included. The data were analyzed using appropriate statistical software and obtaining approval from the institutional review board.

Results: There were 110 children under the age of 18 in the study population. According to the demographic data, the majority of participants (27.27%) were between the ages of 1 and 5 years, with those between the ages of 11 and 18 coming in second (31.82%). With 54.55% of the population being male and 45.45% being female, the gender distribution was nearly equal. Fever was the most prevalent symptom of pneumonia in terms of clinical presentation (81.82%), followed by cough (90.91%) and dyspnea (63.64%). The majority of cases (72.73%) had infiltrates, according to radiological data, followed by consolidation (45.45%). The most often used treatment method was antibiotics (95.45%), and 63.64% of the youngsters needed to be admitted to the hospital. These results shed light on the trends and manifestations of pneumonia in children younger than 18 years old.