The heart of many hospitals is the Neonatal Intensive Care Unit (NICU). It is a place where humanity, ethics, and science collide in dramatic and deeply personal ways as parents, doctors, and nurses grapple with sometimes unanswerable questions: When does life begin? When and how should life end? And what does it mean to be human? The NICU is a place made of stories – the stories of mothers and babies who spend days, weeks and even months waiting to go home, and the dedicated clinicians who care for these tiny, developing humans. Early explores these stories, as well as the evolution of neonatology and its breakthroughs – how modern medicine can be successful at saving infants at five and a half months gestation who weigh less than a pound, when only a few decades ago there were essentially no treatments for premature babies. For the first time, Sarah DiGregorio tells the complete story of this science – and the many people it has touched.