Participants: The study will be conducted in three sites - urban slums and resettlement colonies in the national capital region, rural (predominantly tribal) Rajasthan, rural and urban Tamil Nadu. Field workers will survey the study area to measure mid-upper arm circumference (MUAC) in children 6 to 59 months of age and refer children with MUAC less than 13 cm to a study clinic. At the study clinic, anthropometric measurements will be taken and children with weight for height less than -3 SD of the WHO standards or oedema of both feet will be offered participation in the study.