An infant’s brain is one of the most powerful learning systems in the world. The learning process begins one month before birth, when the unborn baby’s brain fine-tunes itself according to the immeasurable input it receives that is relevant to the child’s future development. Indeed, disparities in language processing efficiency are already evident at 18 months. And we only let the gap widen, despite the fact that language inequality has nothing to do with biological determinism. Based on the most recent research in neuroscience and cognitive science, together with unprecedented field studies, this book provides parents with the building blocks to ensure their children develop optimally.