Early maturity generally refers to precocious puberty. Girls with precocious puberty are generally characterized by the appearance of secondary sexual characteristics before the age of 9, including breast development, early appearance of pubic hair, and the onset of menstruation. Precocious puberty, also known as premature development of sexual function and early puberty, refers to the appearance of secondary sexual characteristics before the age of 9. Precocious puberty can be divided into central precocious puberty (true precocious puberty), peripheral precocious puberty (pseudo-precocious puberty) and partial precocious puberty. Girls with central precocious puberty may show breast development, the appearance of pubic hair, the first menstruation and other manifestations, and a complete examination may also find ovarian development. Girls with peripheral precocious puberty show breast development, appearance of pubic hair, first menstruation, but no ovarian development; girls with partial precocious puberty show simple breast development, or simple early appearance of pubic hair, simple early menarche, and so on. If you find that your child has the characteristics of precocious puberty, please consult a doctor as soon as possible to find out the cause, so as not to delay the condition.