Two years to six years of age is called

Developmental psychology divides the human lifespan into broad age-based stages named for the physical, cognitive, and social changes typical of that period: infancy or babyhood (birth to about 2 years), childhood — early childhood, roughly 2 to 6 years (sometimes extended to include middle childhood up to about 12) — adolescence (roughly 12 to 18-20 years), and adulthood (18 years onward).

The question asks which stage spans two to six years of age. This 2-to-6-year window is exactly the age band that developmental-psychology and Child Development and Pedagogy (CDP) syllabi label "childhood" (early childhood) — the stage that immediately follows infancy/babyhood (birth to about 2 years) and comes well before adolescence and adulthood.

• Babyhood/infancy ends at about 2 years — exactly where this 2-to-6-year range begins.

• Adolescence begins only around 12 years — well after this range ends.

• Adulthood begins around 18 years onward — also well after this range.

So among the offered stages, only childhood (2 to 6 years) matches the given age range.