Over the years of middle childhood, children who recognize prejudice and react by affirming in their gender and background are likely to develop healthy self-esteem.

The answer is Pride.
It is important for the children to learn that their gender should not be a hindrance for their achievement in the future from the early age.
With this, children will learn logically about the strength and weakness of each of their gender and utilize it to their own benefit, which will lead to the high-self value of themselves.