The standard height of a child is 122.5 cm for girls and 124.0 cm for boys at the age of 7. To truly measure whether a child’s height is standard, a bone age test should be done, which can truly reflect whether a child’s height is normal. It is normal for the bone age to be within one year of the child’s actual age, but it is considered abnormal if it is more than one year above or below. If the height corresponding to the bone age is significantly higher than the actual height of the child, it means that the child is short and the cause of the child’s short height should be clarified. 3-12 years old is the best time for the child to pay attention to the height of the child, if the time exceeds this, once the child enters puberty after 12 years old, there is not much room for the remaining height growth, so it is necessary to actively intervene beforehand.