How long it usually takes for breasts to start developing to get their period varies from person to person, and it usually takes 2 to 2.5 years after the breasts start developing to get their period. Hormone levels tend to be unstable at this time, so the timing is different for everyone.
Under normal circumstances, a girl’s breasts begin to develop from the age of 11 weeks, after about two and a half years of time to menstruation, the breasts began to develop is the initial characteristics of the female secondary sexual characteristics. After three and a half years of development into a mature type, the first menstruation, called menarche, is an important symbol of the beginning of puberty.
The formation of menstruation is due to cyclical changes in hormones in the female body, when the hormone level is low, there will be endometrial shedding of blood, thus forming menstruation, so that week after week, due to the imperfect development of puberty, there may be disorders of the menstrual cycle, generally normal, usually pay attention to hygiene can be.