Final answer:
The neonatal period is the transitional period of life from the first to the thirtieth day after birth, during which newborns make significant adjustments to their new environment.
Step-by-step explanation:
The newborn transitional period of life is called the neonatal period. It refers to the first to the thirtieth day of life outside of the uterus. During this period, newborns make drastic adjustments to a world that is colder, brighter, and louder than the womb, and they experience hunger and thirst. They also go through respiratory adjustments.