From The National Geographic:
The 3.3-million-year-old fossilized toddler was uncovered in north Ethiopia’s badlands along the Great Rift Valley. The skeleton, belonging to the primitive human species Australopithecus afarensis, is remarkable for its age and completeness, even for a region spectacularly rich in fossils of our ancient ancestors, experts say. The new find may even trump the superstar fossil of the same species: “Lucy,” a 3.2-million-year-old adult female discovered nearby in 1974 that reshaped theories of human evolution.
Some experts have taken to calling the baby skeleton “Lucy’s baby” because of the proximity of the discoveries, despite the fact that the baby is tens of thousands of years older.
The child was probably female and about three years old when she died, according to the researchers. Found in sandstone in the Dikika area, the remains include a remarkably well preserved skull, milk teeth, tiny fingers, a torso, a foot, and a kneecap no bigger than a dried pea. Archaeologists hope that the baby skeleton, because of its completeness, can provide a wealth of details that Lucy and similar fossils couldn’t.