Daughters first period?

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Hi ladies, I need some advice. My daughter is 10 and just started her first period. I don’t know what to do, she seems so young for it! I was 12 when I had my first! I know we probably should have “the talk” now, but I don’t know how to go about it. She’s also a bit on the immature side and I don’t want to traumatize her. What should I do? Sorry if I sound dramatic, I’m just worried.