Virginia J. VitzthumJonathan ThornburgHilde Spielvogel2026-03-222026-03-22201910.1016/j.sleh.2019.03.003https://doi.org/10.1016/j.sleh.2019.03.003https://andeanlibrary.org/handle/123456789/86936enNocturnalBreastfeedingPopulationHistoryPsychologyDemographyMedicinePopulation-specific life history tradeoffs in nocturnal breastfeedingletter