Malnutrition is a condition that results from eating a diet in which one or more nutrients are either not enough or are too much such that the diet causes health problems. It may involve calories, protein, carbohydrates, vitamins or minerals. Maybe one of the important causes of the malnutrition is psychological causes and another important cause associated with a good health of baby is breast feeding. Rationale: The prevalence of malnutrition in preschool children poses a significant risk to a child's healthy life, which can lead to complications at the same time or complications in adulthood. It is important to know this so that it becomes clear what matters related to this problem and to treat it. Literature review : According to the other previous study like: The study:Prevalence of malnutrition in Saudi children: A community-based study. (El Mouzan et al., 2010) The objective of this study was to establish the prevalence data, and the conclusion wasprevalence rates are still higher than other countries with less economic resources, indicating that more efforts are needed to improve the nutritional status of children.(El Mouzan et al., 2010) This studycompletely match with our study by age group and very accurate and one of its advantages is that it focused on the prevalence rate in particular and accurate.