The changes take place differently in the body of boys and girls at puberty. These change may be listed as below: There is sudden increase in the height of both boys and girls. However, both reach their maximum height at the age of 17 to 18 years. The voice of boys become hoarse and that of girls become shrill. Shoulders become broader and muscles grow more prominently in boys. In girls, the regions below the waist becomes wider. Hair start growing in different parts of boys and girls. In most of the teenagers, due to increased secretion of sweat and sebaceous gland, get acne and pimples on their face. Onset of puberty brings changes in secondary sexual characters in both male and female. Boys and girls become capable of reproduction. In girls, menstruation starts. Different types of hormones start to release in initiating a reproductive function.