There are several indicators that young children can use to differentiate themselves from other people. When differentiating themselves and their friends, the characteristics used by children younger than 5 or 6 years old are hair color and height.
Broadly speaking, children tend to have a much simpler mindset than adults. Children usually use physical appearance to differentiate themselves from their peers. This is very different from adults who already have a more complex understanding of their friends. Adults tend to use traits and habits to differentiate themselves and their peers. The physical appearance that is usually used by children is hair color and height.
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