In early pubic hair development, pubic hair normally appears a few months after breast development in girls and a few months after penis and testicular development in boys. In early development, pubic hair can appear at any age, more in girls than in boys. The amount of pubic hair is small, and sometimes there is axillary hair, but other sex characteristics are normally developed. Most of them are caused by the consumption of children’s health food containing hormones. What are the causes of premature pubic hair development? Female precocious puberty in children: Precocious puberty is a condition in which puberty develops significantly earlier. Because of the large variation in the start of puberty development in each normal child, it is difficult to determine the absolute limits of normal and precocious puberty development. It is generally considered that female precocious puberty occurs when any one or more of the secondary sexual characteristics, such as breast enlargement, pubic hair growth, axillary hair growth, etc., appear in girls before the age of 8, or when the first menstruation begins before the age of 10. Some scholars also advocate that children with puberty and sexual development earlier than the local average age of normal child development by 2 or 2.5 standard deviations or more is precocious sexual maturity, female precocious sexual maturity accounted for about 0.2 per thousand of all women. Precocious childhood breast hypertrophy: the phenomenon of early appearance of secondary sexual characteristics compared with normal puberty is called precocious puberty, mostly seen in girls. It is generally considered that the second sex body is well developed or some organs are well developed before the age of 8 to 9, such as obvious breast development, good vulva development, pubic hair, axillary hair, rapid body growth, or the onset of menstruation before the age of 10 is called precocious puberty. The phenomenon of early development of female breast caused by precocious puberty is called precocious gynecomastia or precocious gynecomastia. Precocious puberty: Precocious puberty is the early onset of puberty, that is, the appearance of enlarged gonads and secondary sexual characteristics before the age of 8 or menstruation before the age of 10 in females, and before the age of 9 in males. According to the different pathogenesis, precocious puberty can be generally divided into two categories: gonadotropin-releasing hormone (GnRH)-dependent precocious puberty (true precocious puberty) and non-GnRH-dependent precocious puberty (pseudo-precocious puberty), the former being called central precocious puberty or complete precocious puberty, and the latter being called peripheral precocious puberty. In addition, incomplete precocious puberty, such as simple precocious breast development and simple precocious pubic hair, has been classified as a variant type of pubertal development.