Fourth grade girls are about 10 years old and have a normal height of about 140 to 150cm.
The formula for calculating the height of a 10-year-old child is age (years) x 6 + 80, which gives a height of 140cm.
Girls enter pubertal development earlier, if they enter pubertal development at the age of 9, they may enter a period of rapid height growth at the age of 10, and their height may increase by about 10cm per year, so the range of height fluctuation is relatively large, and may also be around 150cm.
Height is also affected by genetic factors, endocrine levels, long-term nutrition, and lifestyle and eating habits.
The height of fourth grade girls fluctuates more, usually around 140~150cm, as long as the height increases by 5~10cm per year, it is considered normal.