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I'm 12 and 5'6 and I weigh 46. But my tall friend is also 12 but weighs 73kg. But it matters how tall you are. So the average for 12 is 40-55 ( that's what it said on a chart) but don't worry if your over.

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11y ago
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Q: How many kilograms should 12 year old girl be?
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