Hi everyone,

Maybe this one pointed in the right direction:

Fujita, M., Roth, E., Lo, Y.-J., Hurst, C., Vollner, J. and Kendell, A. (2012), In poor families, mothers' milk is richer for daughters than sons: A test of Trivers–Willard hypothesis in agropastoral settlements in Northern Kenya. Am. J. Phys. Anthropol., 149: 52–59. doi: 10.1002/ajpa.22092

Katinka Musavaya 
Harare, Zimbabwe

Sent from my mobile

From: Pat Young
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