masoud amiri - Department of Statistics and Epidemiology, Yazd School of Public Health, Shahid Sadoughi University of Medical Sciences,Yazd,Iran.
mehdi Naderi Lordejani - Department of Disease Management, Department of Health, Shahrekord University of Medical Sciences, Shahrekord ,Iran
Hussein Fallahzadeh - Department of Statistics and Epidemiology, Yazd School of Public Health, Shahid Sadoughi University of Medical Sciences,Yazd,Iran
Hassan Askarpour - Department of Disease Management, Department of Health, Yasouj University of Medical Sciences

Intrudoction Human health depends on the impact of two factors of heredity and the environment. The issue of inheritance is of paramount importance, but at the same time, the impact of environmental factors and nutritional conditions is such that it is sometimes even beyond hereditary factors. Survey the status of child development is the most important criterion for identifying health. Methods Sampling was carried out using two stage clustering. The information was collected by means of observation and interviewing by filling in the questionnaire on the field variables. Collected data was analyzed using SPSS software, T-test and Chi-Square tests at a significant level  of  0.05. Results In this study, 900 children were studied. 49% (441 persons) were female and 51% (459 persons) were boys. Of this number of children 700 (77.7%) were of normal weight, 155 (17.3%) were moderate underweight and 45 (5%) had severe underweight. The prevalence of malnutrition was in girls, less than boys. The highest prevalence of malnutrition is in boys at the age 2 years and in girls at the age of 3 years. 91.1% of the population lived in the village, 8.4% lived in the city,  0.5percent were living on the fringes of cities and tribes. In this study, there is a significant relationship between the consumption of illiteracy of mothers and fathers, breakfast in the week, the place of living, the main meal per day, the age of the child, the number of children, the number of children in the family, the hospitalization of the child due to illness and the number of pregnancies Maternal and low weight prevalence (P≤0.05). Conclution This study showed that low prevalence is a combination of malnutrition in the present and the past. Regarding the results and comparison with the standard, environmental factors can be effective in delaying weight gain. Therefore, education of health care and parental care for proper nutrition will lead to the health of children at this stage of growth.

prevalence, low weight, children under six years, Lordegan, شیوع, کم وزنی, کودکان زیر6 سال, لردگان