The left side of the brain really takes on language starting around age 5. Before age 5, damage to either side of the brain is not enough to cause permanent loss of language skills. However, as the brain matures and higher language skills develop, the tendency for permanent language damage to the left side of the brain expands. Adults who injure the left side of the brain’s speech area rarely have any hope of regaining normal speech. Once the tissue of the human brain matures, reorganization is not possible, whereas the child’s brain can actually effectively implement reorganization around the site of injury, allowing for good compensatory brain function. The mechanism of plasticity is not the regeneration of nerve cells, but the fact that synapses on nerve cells can regenerate. And of particular importance is that these synapses are always engaged in interconnection activities. It is these activities that allow various connections to be made between nerve cells and enable the brain to perform various tasks. In fact, brain function does not depend on the absolute number of brain cells, but on the complex network established between them. The material basis for the formation of such networks are synapses, which are strongly growable. Thus, plasticity refers not to the regeneration of nerve cells, but to the great potential of neural circuits due to synaptic regeneration. All of the above indicates the high plasticity of the infant brain. If early intervention is provided to perinatally brain-injured children, it can achieve twice the result with half the effort in promoting recovery and preventing disability.