Girls begin to enter puberty around the age of 11, which is characterized by the following: breast development, growth of pubic and armpit hair, accelerated body growth, and the onset of menstruation. Breast development and menarche are the most prominent features of puberty in girls. Breast development: Women will experience enlargement of breasts, enlargement of areola, etc. Breasts may feel swollen and painful, and it is recommended to wear comfortable undershirts to avoid excessive squeezing of the breasts. Height changes: Women’s height will increase significantly during puberty due to the influence of growth hormone, and as they grow faster, their clothing will be changed more frequently. Female physical signs gradually become obvious: the labia majora and minora become fuller, the uterus and ovaries gradually grow and mature, approaching the shape and size of an adult, accompanied by the onset of menstruation. Armpit and pubic hair begin to grow vigorously. The onset of menstruation is an important sign that a girl is entering puberty. Female sexual maturity is marked by regular monthly ovulation, which is manifested by regular menstrual periods. The first menstrual period is called menarche and usually occurs between the ages of 12 and 18. If there is any abnormality in a girl’s growth process, it is recommended to consult a doctor in time, complete the relevant examinations, and actively deal with it under the guidance of a specialist.