Teeth 'time capsule' reveals that 2 million years ago, early humans breastfed for up to 6 years
Humans' distant ancestor Australopithecus africanus had a unique approach to raising their young, as shown in our new research published today in Nature.
Geochemical analysis of four teeth shows they exclusively breastfed infants for about 6-9 months, before supplementing breast milk with varying amounts of solid food until they were 5-6 years old. The balance between milk and solid food in this period varied cyclically, probably in response to seasonal changes in food availability.
This knowledge is useful on several fronts. From an evolutionary point of view, it helps us understand the particular biological and behavioral adaptations of Australopithecus africanus compared to other extinct human ancestors and modern humans. Read more.