Anthropometric measurement: Field Research Assistant will be trained to take weight and height measurement of the children. Anthropometric measurements will be taken by trained FRA at the time of enrollment and then every 3-months. Each child will be weighed in light clothes with an electronic weighing scale. Inter-observer variation up to 2.5% will be allowed. The standing heights of children will be measured to the nearest 0.1 cm using a locally constructed height stick. Again inter-observer variation up to 2.5% will be allowed. Nutritional status will be assessed by comparing the weight and height of the study children with those of NCHS reference population of the same age and sex with the help of Epi6 computer package program and weight for age "Z" score (WAZ) and height for age "Z" score (HAZ) will be computed (29). Malnourished and stunted will be defined by the WAZ score and HAZ score <-2 respectively.