Hair grows on the face and in the underarms about 2 years after it starts to appear in the pubic area. The precise time for first ejaculation is determined by a combination of psychologic, cultural, and physical factors. In the majority of girls, the first visible sign of sexual maturation is breast budding, closely followed by the growth spurt. Soon afterward, pubic and underarm hair appears. The first menstrual period generally comes about 2 years after the breasts start to enlarge.
Height increases most before menstruation begins.
Delayed Sexual Maturation Delayed sexual maturation is a delay in sexual development. Some adolescents don't start their sexual development at the usual age. In such adolescents, the growth rate before puberty is usually normal. Although the growth spurt and sexual maturation are delayed, they eventually proceed normally. Various abnormalities can delay or prevent sexual development.