At what age is a child classified as a newborn?

A child is classified as a newborn from birth up to the age of 28 days. This period is significant as it includes the most critical moments of a child's early life, where they undergo rapid physical and biological changes. This classification helps healthcare professionals understand the unique needs and vulnerabilities of newborns.

The other options present different stages of a child's development. A child who is 1-2 days old is still within the newborn classification, but the term specifically refers to those immediately after birth. Likewise, a child who is 1 week or 1 month old is no longer considered a newborn, as they have moved into the infant stage, which has different health assessments and considerations. Recognizing this classification is essential for providing appropriate medical care and interventions during these crucial early days of life.