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The Effect of Changing Medical Advice on Breastfeeding The Leakey Foundation - California Academy of Sciences All primates have drawn-out life histories with long pregnancies and extended suckling. Time devoted to individual offspring more than compensates for limited daily investment in reproduction. A key part of intensive maternal care in primates is frequent suckling on demand, reflected in milk composition. In all these respects, humans are typical primates; but we also have special features, notably in brain development. But how long should a mother suckle her baby? Biological comparisons yield clues to the natural breastfeeding period for which women are adapted.
