1.3 Procedure A detailed medical history will be recorded. Body weight and height will be measured upon enrolment into the study. Naked weights will be obtained to the nearest 10 g using a balance scale (Gebrüder Soehnle, Murrhardt, Germany) and the mean of three consecutive measurements recorded. Recumbent length will be measured in children less than two years of age using a slideboard infantometer (Harpenden, St. Albans, England). In older children, standing height is to be determined using a locally constructed instrument in which a metal tape measure is extended between a footplate and head bar that has an attached fluid level to ensure a horizontal position. The mean of two consecutive height measurements to the nearest 0.1 cm is recorded as the observed value. Measurements are compared to the standards according to the National Center for Health Statistic data and the nutritional status assessed by Z-score. , Percent of median equivalents of standard deviation units will be determined and categorized according to the scheme of Waterlow.