A specialization of human, and an instance of type of person classified by life stage. Each instance of this collection is a human in the infant stage of life. Functionally, this ends when the infant learns to walk (even just toddle) and/or talk (even a few words)... or, at latest, when the person's age greatly exceeds that at which most people develop those skills. Generally, this means that it spans the period from birth to about 12 - 18 months old. A notable specialization of this collection is newborn baby.