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女性胸部发育叫做第二性征的发育，第二性征发育一般会有月经初潮，而月经初潮是女性性发育的标志。随着现在生活水平的提高，这个年龄实际在提前。女孩月经初潮平均年龄现在是10岁左右或者10-11岁，提前一年左右就会出现乳腺的发育，局部可能会出现乳晕

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女孩胸部什么时候开始发育

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