Why has my pre-teen daughter started growing armpit hair? She's 10!
Auxiliary hair, such as armpit hair, can show up in a typical girl anywhere from 10 to 16 years of age. The average time for developing auxiliary hair is 11. So your daughter is within the normal range.
But a hedge? At 10? It's as thick as mine, black as midnight and hard to keep trimmed back. Not to mention the 'other' place. Could sex with our neighbor's boy have spurred this? I'm worried.
The color and thickness of pubic and auxiliary hair are determined by genetics and time in development, not by actions. Sexual behavior typically comes because a child has started developing. The exception to this rule is when a child has been sexually abused. Then a child may act in a sexual way from imitating the behavior forced on them. But such is out of character for a child, which is why we rightly get upset by it. However, sexual behavior doesn't cause development.