This was a pretty cool article to me. i show you apicture so u caan understand the skeleton they are referring to but i can just let you read a little bit of waht was said about it.

The nearly complete skeleton, missing only the pelvis and a few other bones, comes from a 3-year-old Australopithecus afarensis female who died about 3.3 million years ago, say Zeresenay Alemseged of the Max Planck Institute for Evolutionary Anthropology in Leipzig, Germany, and his colleagues.
"This [new fossil] is something you find once in a lifetime," says Zeresenay.
The Dikika child's skeleton has not yet been entirely removed from the surrounding rock. Zeresenay's team plans to compare it with Lucy, the 3.2-million-year-old partial skeleton of an adult female A. afarensis, which was unearthed in 1974.
The researchers found the child's skeleton between previously dated volcanic-ash layers. A flood apparently covered the child's body in sand and pebbles, protecting it during fossilization.