There is no uniform standard for the height and weight of girls, and the body mass index (BMI) is generally used as a measure, with 18.5 to 23.9 being considered normal. Among girls, different individuals may have different heights and weights, and there is no standardized medical reference index, but the body mass index is usually used as a measure of normalcy to evaluate the physical development and nutritional status of girls. BMI is calculated as weight (kg)/height (m)2. Generally speaking, a value between 18.5 and 23.9 is considered normal, while a value of less than 18.5 is considered thin, while a value of more than 24 is considered overweight, and a value of more than 28 is considered excessively obese.