In the Introduction, the author reflects on the transformative experience of becoming a parent, particularly with the arrival of the first child. Oster describes the stark contrast between the anticipation before childbirth and the surreal moments that follow, emphasizing the unique challenges and hazy quality of the initial hours and days after delivery.

The author recounts personal experiences in the hospital, highlighting the dreamlike nature of those early days with sharp and specific memories intertwined with a sense of unreality. Oster emphasizes the overwhelming focus on the newborn, noting her constant desire to stare at the baby, even during attempts to sleep. The introduction sets the stage for the ensuing chapters, suggesting that amidst the dreamlike state, important decisions about procedures, complications, and parenting choices will arise, and Oster encourages readers to consider and prepare for these decisions in advance, recognizing the potential for confusion and conflicting advice during the postpartum period. The author foreshadows discussions on hospital-related issues and challenges in the first weeks at home, hinting at the forthcoming exploration of significant parenting decisions in the subsequent part of the book.