The height and weight of a 12-year-old child is calculated by the formula, the standard height is about 152cm, the standard weight is about 39.5kg, but the weight and height are also related to genetics, nutritional status, etc., so there are individual differences. Clinically, there are corresponding calculation formulas for different age groups, the height formula for children aged 7 to 12 years is [age (years) x6+80] cm, and the weight formula is [age (years) x7-5]/2. Therefore, it is calculated that for a 12-year-old child, the standard height is about 152cm, and the standard weight is about 39.5kg. However, this is only an estimation. A person’s weight and height have a lot to do with genetics and nutritional status. If a 12-year-old child’s height and weight are significantly different from those of babies of the same age, he or she should go to the hospital to check for abnormalities such as lack of growth hormone or over-nutrition.