There isn't a specific measurement for hip size that applies universally to all 12-year-old girls, as growth and body shape can vary widely due to genetics, nutrition, and individual development. Typically, girls may begin to experience changes in body shape during puberty, which can include widening of the hips. It's more important to focus on overall health and well-being rather than specific measurements. If there are concerns about growth or development, consulting a healthcare professional is recommended.
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