1. The first change in a girl’s body is that the breasts begin to develop. This is called thelarchy.
2. Body height and weight increase rapidly.
3. Armpit hair and pubic hair begin to grow. This is called pubarche.
4. Skin becomes shiny, permanent teeth begin to emerge.
5. Fat accumulates in the hips, thighs and breasts and gives the body a feminine elegance.
6. Estrogen hormone secretion increases.
7. Ovaries, uterus and vagina increase in size.
8. Menstruation begins. The first cycle is called menarche.
9. Heart rate and blood pressure increase.
10. Breathing is deep.