The first stage is from birth to 3 weeks of age, when the height growth of infancy is the fastest, from 3 weeks of age to puberty, the child grows about 7-8cm per year on average. The second stage is from the beginning of puberty, the child will have a rapid growth time, that is, there is a sudden increase in puberty time, because the body estrogen levels rise leading to the phenomenon of accelerated epiphyseal closure. Once a girl enters puberty, her height will gradually decline after the sudden increase, and the growth will stop after the epiphysis closes. Therefore, if a girl’s height is not high after she enters puberty, she needs to actively undergo a bone age test to clarify whether there is a gap in her child’s height and give treatment if necessary.