Kohlberg proposed that children develop gender understanding through cognitive stages. As their thinking becomes more advanced, they build a more stable concept of gender, which then guides their own behavior.

Kohlberg’s cognitive explanation

Kohlberg argued that children are not passive recipients of gender roles. Instead, they actively organize information about themselves and other people. Gender development depends on changes in thinking, so children understand gender differently at different ages.

According to Kohlberg, children first need to understand what gender is before they strongly try to behave in gender-appropriate ways. This means cognitive development comes before consistent gendered behavior, rather than the other way around.

His theory is often described as a cognitive developmental approach because it links gender learning to mental maturation and stage-like changes in understanding.

The three stages

1. Gender identity

The first stage is gender identity, usually reached at about ages 2 to 3.

At this stage, children can usually say whether they are a boy or a girl and can label other people in the same way. However, this understanding is basic. Children often judge gender from outward features such as hair length, clothing, or activities. Because their thinking is still limited, they may believe that changing appearance means gender has changed.

2. Gender stability

The second stage is gender stability, usually reached at about ages 4 to 5.

Children at this stage begin to realize that boys grow up into men and girls grow up into women. They now understand continuity across time, but their thinking is still affected by superficial cues. As a result, they may still believe gender can change in different situations if appearance or behavior changes. Their knowledge is therefore more advanced than at the first stage, but it is not yet fully mature.

3. Gender constancy

The final stage is gender constancy, usually reached at about ages 6 to 7.

Diagram of Piaget’s water-level task: the same container is shown upright and then tilted, and the learner must infer the new (still horizontal) water level. It illustrates the broader cognitive shift from perceptual responding to rule-based reasoning about invariants under transformation, which parallels Kohlberg’s claim that children eventually understand gender as stable despite superficial changes. Source

At this point, children understand that gender is permanent. They know that temporary changes in clothes, hairstyle, or activities do not alter whether someone is male or female. For Kohlberg, this is the crucial stage because it gives children a secure concept of their own gender and the gender of others.

Why gender constancy matters

Once children achieve gender constancy, they become motivated to seek out information linked to their own gender. Kohlberg argued that this produces self-socialization.

Children are more likely to pay attention to same-gender role models, remember gender-relevant information, and prefer activities they see as appropriate for their own gender. In this view, children behave in gender-typed ways because they want consistency between who they believe they are and how they act.

This is a key feature of the theory: understanding comes first, and imitation becomes more selective afterward.

Evidence and evaluation

A strength of Kohlberg’s theory is that it gives a clear developmental sequence. It explains why very young children can label gender without fully understanding its permanence. This helps psychologists separate simple labeling from a deeper, more stable concept of gender.

Research has also offered some support for Kohlberg’s claim that children show stronger same-gender attention after reaching constancy. In a well-known study, Slaby and Frey found that children with higher gender constancy paid more attention to same-sex models on screen.

This supports the idea that children become more motivated to learn gendered behavior once their understanding is more secure.

However, the theory has been criticized for placing gendered behavior too late in development. Many children show strong toy preferences and stereotyped choices before the age at which Kohlberg said full constancy is usually reached. This suggests that some aspects of gender development may begin earlier than the theory predicts.

Another limitation is that the stage model may be too rigid. Development may be more gradual than Kohlberg proposed, and children may show partial understanding that does not fit neatly into one stage. A child might understand one aspect of constancy but still be confused by another.

There are also methodological issues. Young children may struggle with the wording of interview questions or may be distracted by visible features in pictures. This means researchers could underestimate what children truly understand about gender if tasks are too verbally demanding or artificial.