Research on the development of gender identity has shown that

a. children develop gender constancy, which is the basis for other components of gender identity.

b. some children have a full concept of gender identity by age 2 years.

c. about 10% of children have at least one component of gender identity unresolved during preadolescence.

d. children show individual variability in age but not in the sequence in which they develop the components of gender identity.