What is a 12 year old girl meant to weigh?

The average weight for a 12-year-old girl, in the United States, is 86 pounds. Individual weights can vary based on factors such as height, body composition, and genetics. It's important to note that weight is just one factor in overall health and well-being, and the focus should be on overall health, nutrition, and proper physical activity rather than a specific number on a scale.