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Many things will happen to a child's body at this time of their life. Girls will start their period and become sexually mature, their hips will get wider and their breasts will start to develop. They will also develop hair on their bikini line and under their arms. Boys will notice that their penis enlarges, they will get wet dreams, will become more muscly and will get hair on their face, chest, underarms and round by the penis.

Not everyone starts at the same age, but it is normally between eight and twelve and when girls reach twelve to sixteen, their periods will start.

Q: Physical development 12-16 years

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