儿童的生长期发育,包括性腺和第二性征的发育,是有其自身规律的,生长过快或过慢都是不正常的。一般说宋,性早熟是指女孩在8岁以前或男孩在10岁以前,性发育就已经开始。他们不仅性腺发育成熟,而且出现了第二性征,如女孩长阴毛、来月经、外生殖器发育成熟、乳房丰满等;男孩则会出现阴茎增大、阴毛出现、长胡须、出现喉结等。性早熟的原因很多,比较常见的有遗传因素、营养过度、肿瘤、外源性性激素进入体内等。现代科学研究表明,照明和光线也是导致少年男女青春期提前、出现性早熟的重要原因之一。在现代人类生活中,尤其是都市生活,人们越宋越偏爱夜生活。五彩缤纷的灯光通宵达旦,“不夜城”比比皆是,这就造成人类接受 Children’s growth and development, including the development of gonads and secondary sexual characteristics, has its own laws, growth is too fast or too slow are not normal. Generally speaking, Song, precocious puberty refers to the girl before the age of 8 or the boy before the age of 10, sexual development has already begun. They not only mature gonads, but also secondary sexual characteristics, such as girls long pubic hair, to menstruation, genital maturity, breast fullness; boys will appear penis enlargement, pubic hair, beard, Adam’s apple. Sexual precocity for many reasons, the more common genetic factors, over-nutrition, cancer, exogenous sex hormones into the body and so on. Modern scientific research shows that lighting and light are also one of the important causes of precocious puberty in adolescent boys and girls. In modern human life, especially urban life, the more people prefer the nightlife in Song Dynasty. Colorful lights all night long, “never sleeps ” abound, which led to human acceptance