Supplementary Informations These SI are linked to: Isobiography of the first farmers: effects of age-estimating referential and statistical models on reconstructing infant life *Samuel Bédécarrats1, Mélie Le Roy2, Kerry L. Sayle3, Frédérique Blaizot4, Maëlle Couvrat1, Yves Gleize5,6, Guillaume Leduc7, Stéphane Rottier6, Gwenaëlle Goude1 Affiliations: 1- CNRS, Aix Marseille Université, Ministère de la Culture, INRAP, LAMPEA, Aix-en-Provence, France 2- Department of Archaeology And Anthropology, Faculty of Science and Technology, Bournemouth University, Poole, UK 3- SUERC, University of Glasgow, Scottish Enterprise Technology Park, East Kilbride, UK 4- UMR 8164 HALMA, CNRS, Université de Lille, Inrap, Lille, France 5- Inrap Nouvelle-Aquitaine et Outre-mer, Bègles, France 6- UMR 5199 PACEA, CNRS, Université de Bordeaux, Ministère de la culture, Bordeaux, France 7- Aix Marseille Université, CNRS, IRD, CdF, INRAE, CEREGE, Aix en Provence, France *Corresponding author: samuel.bedecarrats@univ-amu.fr ; orcid: 0000-0001-6016-577X Description: 3D_1 to 4: Surface scans taken with an Artec Spider before sampling for the Brézet individuals studied by Frédérique Blaizot. The scans were taken by Maëlle Couvrat. Fig_1 to 24: Graphical representation of the age adjustment of isotope measurements for all individuals using linear models (LM) or generalised additive models (GAM). Where possible, both the (Moorrees et al. 1963 a and b) and (AlQahtani et al. 2010) standards were used for age estimation. Material preparation and isotopic measurements were carried out by Gwenaëlle Goude, Kerry L. Sayle and Guillaume Leduc. Plots were generated by Samuel Bédécarrats using the R script developed for the study. Table_1: raw data of all isotopic measurements, table provided by Kerry L. Sayle. Table_2 to 4: measurement errors for isotopic measurements, table provided by Kerry L. Sayle. Table_5 to 8: Individual raw data compiled by Gwenaëlle Goude and age estimates calculated by Samuel Bédécarrats. Table_9 to 12: dental maturity standards from (Moorrees et al. 1963 a and b) compiled in (Harris 2018; Harris and Buck 2018) and from AlQahtani et al. 2010. Script_1: R script used to perform the age estimation, written by Samuel Bédécarrats. All supplementary information was compiled by Samuel Bédécarrats. This work was funded by the French National Research Agency (ANR Women SOFar 21-CE03-0008) https://womensofar.hypotheses.org/. Bibliography: AlQahtani, S.J., Hector, M.P., Liversidge, H.M., 2010. Brief communication: The London atlas of human tooth development and eruption. Am J Phys Anthropol 142, 481–490. https://doi.org/10.1002/ajpa.21258 Harris, E.F., 2018. Primary Tooth Mineralization and Exfoliation Ages Calculated from the Moorrees-Fanning-Hunt Study. DAJ 23, 61–65. https://doi.org/10.26575/daj.v23i2.77 Harris, E.F., Buck, A.L., 2018. Tooth Mineralization: A Technical Note on the Moorrees-Fanning-Hunt Standards. DAJ 16, 15–20. https://doi.org/10.26575/daj.v16i1.165 Moorrees, C.F.A., Fanning, E.A., Hunt, E.E., 1963a. Age Variation of Formation Stages for Ten Permanent Teeth. J Dent Res 42, 1490–1502. https://doi.org/10.1177/00220345630420062701 Moorrees, C.F.A., Fanning, E.A., Hunt Jr., E.E., 1963b. Formation and resorption of three deciduous teeth in children. American Journal of Physical Anthropology 21, 205–213. https://doi.org/10.1002/ajpa.1330210212