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Most children develop a clear-cut sense of whether they are boys or girls at a young age.
For most children this develops somewhere between 18 and 30 months of age. After gender identity is formed, then gender stability develops. Gender stability is the realization that girls grown up to be women, that they don't grow penises and becomes men, and vice versa. Little boys realize that their penises will not fall off and that they won't grow a vagina and become a woman. It is during this period of gender stability development that many children develop stereotypic behaviors appropriate to their gender identity.