It is generally accepted that secondary sexual characteristics can begin to develop at the age of 9 to 11 for girls.
It is generally believed that the secondary sexual characteristics of girls aged 9 to 11 years can develop, including the development of breasts, pubic hair, axillary hair, etc., but there is a sequence. Breast development is often the first manifestation of female secondary sexual characteristics, manifested by the enlargement of the areola and nipple, followed by the enlargement of the breast.
It takes 7 to 10 years for the development of female secondary sexual characteristics to reach the adult level. The onset of menstruation is also a milestone in the development of female secondary sexual characteristics. The onset of menstruation is often 2 to 3 years later than breast development, and it suggests the onset of cyclic ovulation, marking the beginning of the development of reproductive functions.
Therefore, in the stage of puberty from 9 to 11 years old, parents need to pay close attention to the physiological and psychological changes in girls, it should be noted that if the girl before the age of 8 years old, breast development, need to go to the hospital children’s health department for timely consultation, so as not to affect the future development of height.