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Children as young as age two may show features that could indicate gender dysphoria.
They may express a wish to be of the other sex and be unhappy
about their physical sex characteristics and functions.
In addition, they may prefer clothes, toys, and games that are commonly associated
with the other sex and prefer playing with other-sex peers.

There appears to be heterogeneity in these features:
Some children demonstrate extremely gender nonconforming behavior and wishes,
accompanied by persistent and severe discomfort with their primary sex characteristics.
In other children, these characteristics are less intense or only partially present

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In most children, gender dysphoria will disappear before or early in puberty.
However, in some children these feelings will intensify and body aversion will develop
or increase as they become adolescents and their secondary sex characteristics develop