Before Chelsea Conaboy gave birth to her first child, she anticipated the joy of holding her newborn son, the endless dirty nappies and the sleepless nights. What she didn't expect was how different she would feel. It wasn't simply the extraordinary demands of this new role, but a shift in self - as deep as it was disorienting. In truth, something was changing: her brain. New parents undergo major brain changes, driven by hormones and the deluge of stimuli a baby provides. These neurobiological changes help all parents - birthing or otherwise - adapt in those intense first days and prepare for a long period of learning how to meet their child's needs. Yet this science is mostly absent from the public conversation about parenthood. Conaboy delves into the neuroscience to reveal unexpected upsides, generations of scientific neglect and a powerful new narrative of parenthood.