What age range does the neonatal period cover?

The neonatal period refers to the time shortly after birth and extends from birth until the baby is about 28 days old. This critical phase is characterized by significant physiological and developmental changes as the newborn adapts to life outside the womb. During this time, essential developments occur, such as the establishment of feeding patterns, the development of sleep-wake cycles, and the emergence of basic reflexes.

The correct choice accurately reflects this specific age range of up to 28 days, distinguishing it from the other options that represent much longer durations. For instance, one week or one year does not encompass the full scope of the neonatal period, which is more defined and specific. Thus, understanding that the neonatal phase is limited to the first 28 days post-birth helps set a clear foundation for understanding early human development.