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A lot of it is genetic, but since you asked for the facts, here they are: I found a US pediatric chart for girls from age 2 - 20 on About.com (Pediatrics) that seems to be the most current. The average height for a ten year old girl is approximately 52-54 inches and the average weight is around 70- 75 lbs. See the link below. It is hard to read, so be prepared!

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16y ago

What else can I help you with?