Infants and toddlers experience life more holistically than any other age group. Social, emotional, cognitive, language, and physical lessons are not learned separately by very young children. Adults who are most helpful to young children interact in ways that understand that the child is learning from the whole experience, not just that part of the experience to which the adult gives attention.
Other definitions
According to National Association for the Education of Young Children is spans the human life from birth to age 8.
