Breast development is not directly related to menarche. Breast development is generally the development of mammary glands and areola, which is mainly manifested in the gradual enlargement of breasts and nipples as well as areola. Generally speaking, at the age of 10 to 11 years old, the embryonic base under the mammary gland starts to grow, the mammary glands are gradually bulging, and the mammary glands will basically be mature at the age of 14 to 15 years old. The ovarian function and regulation of girls at the time of menarche are not stable, and menstruation is not regular at the beginning of menarche, and even some girls will have menstruation for the second time only after an interval of a few months or half a year after menarche, and along with the growth of age, the ovaries will gradually develop and mature, and then menstruation will come on a regular basis in the later stage of menarche. When breast development, pay attention to the correct wearing of underwear, so as not to affect the normal development of underwear is too small, and then pay attention to clean breasts, adhere to the nipple washing water, so as not to breed bacteria and thus affect the development of the mammary glands. When the menarche comes, pay attention to cleanliness and hygiene, use warm water to wash the vulva, avoid spicy, pay attention to keep warm, so as not to get cold.