女孩性早熟，是指女孩在８岁前就出现乳房增大，有乳核并有触痛，多为两侧乳房同时增大，但也有的开始时仅是一侧乳房增大，以后另一侧乳房才增大；随着乳房增大，可以出现乳晕的着色，常在９岁前出现腋毛和阴毛；随着外生殖器发育、阴道分泌物增多，１０岁前可来月经。男孩性 Girl precocious, refers to the girl appeared in the age of 8 breast enlargement, with milk nucleus and tenderness, mostly at the same time on both sides of the breast increases, but also some began to increase only one side of the breast, after another The side of the breast increases; with the breast enlargement, may appear areola color, often in armpits and pubic hair before the age of 9; with the development of the external genitalia, vaginal discharge increased, 10 years before menstruation. Boy sex