How does Augustus' skill relate to Titus? What other babies are talked about in this section?

A youngster named Titus discovered the clapping sound made by "whacking both hands rapidly under his relaxed chin" and causing his teeth to clack together sharply. When he began doing this, Augustus resumed the hand clapping. Another infant mentioned was Kweli. Kweli often crawled over to Fossey before rolling around, chuckling and returning to her mother, Macho.