The height of a normal newborn at birth is about 50 cm on average; the fastest growth rate is about 25 cm in the first year, and the second year is a little slower, about 10 cm. The formula for estimating height from 2 to 12 years old: height = 7 x age + 75 in cm. After the age of 3, the measurement can be done in standing position. Height is related to genetics, nutrition, exercise and other factors, so there are individual differences, and it does not exactly follow the estimated formula for development.