How Much Should I Weigh at Age 12?
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Girls' Weight
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About 80 percent of girls weigh between 72.5 lbs. and 123 lbs. right after their 12th birthday. After gaining anywhere from about 7.5 lbs. to 13 lbs. during the year, 80 percent of girls weigh between 80 lbs. and 134 lbs. when they are about to turn 13.
Boys' Weight
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The middle 80 percent of boys weigh between 71 lbs. and 119 lbs. when they turn 12 years old. Boys typically gain between 8 lbs. and 13 lbs. during the year and 80 percent of boys weigh between 79 lbs. and 132 lbs. when they turn 13.
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Bottom Line
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Most 12-year-olds weigh 70 to 130 lbs., with an average of 95 to 96 lbs., according to the Centers for Disease Control and Prevention. The wide range is because children typically have a growth spurt around this age, but some 12-year-olds have not yet started this spurt.
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