Childhood is the age span ranging from birth to adolescence

Adolescence

Adolescence is a transitional stage of physical and mental human development generally occurring between puberty and legal adulthood , but largely characterized as beginning and ending with the teenage stage...

. In developmental psychology

Developmental psychology

Developmental psychology, also known as human development, is the scientific study of systematic psychological changes, emotional changes, and perception changes that occur in human beings over the course of their life span. Originally concerned with infants and children, the field has expanded to...

, childhood is divided up into the developmental stages of toddlerhood (learning to walk), early childhood

Early childhood

For the video game rating with a similar age group see ESRBEarly childhood is a stage in human development. It generally includes toddlerhood and some time afterwards. Play age is an unspecific designation approximately within the scope of early childhood.-Education:Infants and toddlers experience...

 (play age), middle childhood (school age), and adolescence

Adolescence

Adolescence is a transitional stage of physical and mental human development generally occurring between puberty and legal adulthood , but largely characterized as beginning and ending with the teenage stage...

 (puberty through post-puberty).
The term childhood is non-specific and can imply a varying range of years in human development. Developmentally, it refers to the period between infancy and adulthood.