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In this paper, we analyze the changes in food consumption patterns throughout the lives of five individuals (n=5), one subadult and four adults, found in archaeological sites of El Remate, Bajo los Cardones and Finca Cruz. All of them are associated with the Formative period (ca. 2500 - 1000 years B. P.) and are located in the Quebrada de Amaicha (Tucumán, Argentina). We propose an analysis of the carbon and nitrogen isotopic composition in the dentin of different sections of the same tooth and in different teeth of the five individuals. This approach sheds light on the way in which the characteristics of children's diets affect their adulthood, as well as providing a more inclusive perspective on consumption patterns in the agropastoralist societies of the study area by integrating young individuals into the analysis. Little intravariation and intervariation was found, with a predominance of food resources framed in the C4 photosynthetic pattern. The exception is an individual, probably female, whose diet was based on C3 resources during the first period of life. This could be the result of the existence of a "childhood diet" or of a change in geographic residence, with both areas being isotopically distinguishable. Finally, we illustrate the methodological steps required to reconstruct life histories through the serial study of human dental pieces. This is a novel approach, which has been applied to human remains from the Argentine Northwest for the first time. [ABSTRACT FROM AUTHOR]