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. 2014 Oct 31;26(1):269–281. doi: 10.1093/beheco/aru186

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© The Author 2014. Published by Oxford University Press on behalf of the International Society for Behavioral Ecology.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

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Residualized scatter plots and fitted regression line for milk cortisol parameters and infant temperament factor by infant sex. Nervous temperament of daughters in relation to cortisol concentrations in milk at early lactation (A) and for sons in relation to the change in cortisol concentrations in milk from early to peak lactation (B). Confident temperament of daughters in relation to cortisol concentrations in milk at peak lactation (C) and for sons in relation to the change in cortisol concentrations in milk from early to peak lactation (D).