Background and Objectives: The term malnutrition refers to both undernutrition as well as overnutrition. Undernutrition is a condition in which there is inadequate consumption, poor absorption or excessive loss of nutrients. Overnutrition is caused by overindulgence or excessive intake of specific nutrients. By using WHO guideline, to identify the children with SAM from the patients admitted in department of Pediatrics, PMCH, Patna. Method: This observational study will be carried out on admitted patients in upgraded department of Pediatrics, PMCH, Patna from January 2018 to November 2019. Conclusion: Prevalence of Malnutrition is almost similar in both the sexes with slight male dominance. Most of the malnourished child are in the age group of 6 to 12 months, and mean age of presentation was 20 month.