The study aims to assess the best data on the prevalence, diagnosis, and treatment outcomes of comorbidities related to child malnutrition. A comprehensive analysis of previous quantitative research served as the basis for this study’s design. The level of methodological rigor of the investigations was evaluated using several critical appraisal techniques. Data were extracted according to the predetermined data extraction table. A narrative analysis of the data was performed in accordance with the predetermined study objectives and primary concepts. About 15 studies met the criteria to be included in the review. Each of the 15 research reports on the prevalence of one of the 4 comorbidities linked with child malnutrition. As a treatment result of child malnutrition-associated comorbidities, the length of hospitalization or stay was reported by 5 (n = 5/15) of the studies, the recovery rate was given by 10 (n = 10) of the studies, and the mortality rate was reported by 9 (n = 9/15) of the studies. Anemia, TB, pneumonia, and gastroenteritis were the comorbidities observed in malnourished children more frequently than others. The treatment outcomes identified were identified by the length of the patient’s hospitalization or stay, the rate of recovery, and the mortality rate. The diagnosis and treatment of frequent comorbidities in malnourished children should be considered standard operating procedures in clinical settings. Comorbidities connected with malnutrition in children under the age of five need to be investigated further through additional research.