Why do newborns sleep a lot?

Newborns sleep a lot, typically 14 to 17 hours a day, because their bodies and brains are rapidly developing. Sleep is crucial for growth, as it supports brain development and helps regulate essential functions like metabolism and immune response. Additionally, their sleep patterns include shorter cycles and frequent awakenings for feeding, which is necessary for their nutritional needs. This extensive sleep helps them transition into a more regular sleep pattern as they grow.