Evolution of Mothering: How Long Should a Baby Suckle? 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."
Dr. Robert Martin is A. Watson Armour III Curator of Biological Anthropology at the Field Museum in Chicago. He has devoted his career to exploring the evolutionary tree of primates, as summarized in his 1990 textbook Primate Origins. Dr. Martin is particularly interested in reproductive biology and the brain, because these systems have been of special importance in primate evolution. His research is based on broad comparisons across primates, covering reproduction, anatomy, behaviour, palaeontology and molecular evolution.