This study aims to see if improving nutrition can help undernourished children with cancer do better during treatment. Specifically, it will test if giving them a special food supplement with the right amounts of protein, calories, vitamins, and minerals can help them handle chemotherapy, reduce health issues, and improve their chances of survival. The study will focus on children in need, particularly in less developed countries. For 10 days, 30 children will take part in the study. The children will be given a daily 40-gram food supplement, divided into four small servings throughout the day. The supplement comes in four flavors: Maggie masala, chocolate, chat masala, and unflavored. In the first 3 days, all flavors will be given to the children. After that, parents will help their child pick their two favorite flavors to continue with. A dietitian will closely monitor the children’s health, and parents will fill out a simple questionnaire about how the child likes the food, as well as keep a diary of any reactions or changes they notice. Nutritional assessments will be done on the first and last day of the study to check for improvements, and blood samples will also be taken to study how the supplement affects the children’s bodies. Throughout the study, the parents will be kept informed and supported by the study team. The goal is to gather valuable information on how nutrition can improve cancer treatment outcomes for these children and acceptability of the formulation by children.