Adaptation to extrauterine life refers to the process of a newborn baby's adjustment to the outside world after spending nine months in the womb. There are several synonyms for this term, including neonatal transition, postnatal adjustment, and perinatal acclimatization. These phrases all refer to the physiological and psychological changes that a newborn experiences in the first few days of life, including the establishment of breathing, digestion, and circulation. Adaptation to extrauterine life is crucial for the survival of the newborn and the successful integration into the family and society. Understanding this process helps parents and caregivers provide appropriate support and care during the critical early stages of life.