At birth, a baby's brain already has 100,000,000,000 cells. This is about the same number of stars in the Milky Way. Unlike the rest of a new baby's body, the brain is not complete at birth. In order to start working, the cells need to communicate with each other. As a baby starts to experience life, connections are made between cells - the more connections there are, the more the brain can do. A baby's brain develops so fast that by age two a child who is developing normally has the same number of connection as an adult. By age three, a child has TWICE as many brain connections as an adult.