A 7-year-old girl weighs 49.5 pounds and stands 47.7 inches tall, according to Disabled World, while a 7-year-old boy weighs 50.5 pounds and reaches 48 inches tall. They do add, however, that these are simply rough averages because children grow at different rates and there is no single weight that children of any age should weigh.
Because children’s height, weight, bone composition, and body fat levels change fast, preliminary estimations of body weights should be used in conjunction with BMI calculations for age and gender. BMI, which is calculated as weight in pounds divided by height in inches times height in inches, times 703, is a better marker for healthy weight in children, according to the Centers for Disease Control and Prevention. Although BMI is not a diagnostic tool, it can be used to screen for overweight and obesity in children. For a boy who has just turned 7, a BMI between 14 and 17.4 falls between the 10th and 85th percentile, whereas for a girl, a BMI between 13.79 and 17.62 falls between the 10th and 85th percentile. The BMI percentiles for children aged 2 to 20 years fluctuate monthly.
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