Weight of the children will be measured to the nearest 100 g using a digital scale. Height of the child will be determined with a locally constructed instrument in which a plastic tape measure is extended between a footplate and head bar. Height will be measured within 0.1 cm. The mean of three consecutive measurements (height and weight) will be considered as the observed value. This will be done during data analysis. All measurements will subsequently be compared to the standards according to the WHO 2006 growth standards and the nutritional status will be assessed by z-score. All anthropometric measurements will be performed by trained and experienced field workers following standard procedures.