J. Cravioto, H. G. Birch, E. de Licardie, L. Rosales, L. Vega, The Ecology of Growth and Development in a Mexican Preindustrial Community Report 1: Method and Findings from Birth to One Month of Age, Monographs of the Society for Research in Child Development, Vol. 34, No. 5, The Ecology of Growth and Development in a Mexican Preindustrial Community Report 1: Method and Findings from Birth to One Month of Age (Aug., 1969), pp. iii-iv+1-76
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Cravioto et al. (1969) studied this question.