Early Child Development and Nutrition in Guatemala

Inclusion Criteria: * Child speaks Spanish. * Child is age 6-12 months or age 36-48 months. * Child must be undernourished (length and height for age \< -1 z-score). * Child does not have any obvious health or developmental problems that would interfere with growth, nutrition, or development. * Child will remain in the area for the subsequent year. * Parent or legal guardian of the child is age 18 years or older. * Parent or legal guardian speaks and understands Spanish. * Parent or legal guardian lives with child in study community. Exclusion Criteria: * Child is not age 6-12 months or 36-48 months. * Child has severe stunting (length and height for age \< -3 z-scores). * Child has identified conditions that could interfere with their development and growth. * Child is severely anemic (hemoglobin \< 7).