Boys pubic hair began to develop with genetic factors, age, diet and other factors, generally at about 10 years of age, 10-year-old boys appear to grow a few pubic hair is a normal phenomenon, does not belong to the precocious puberty. Boys pubic hair development by the body of androgens, and at the same time with genetic factors, age, diet and other factors related to the general appearance at about 10 years old, if the daily life diet and nutrition is good, the development may be earlier. 10-year-old boy and in the stage of sexual development, this time the physiological and psychological began to appear gradual development, by the influence of androgens, this time the pubic hair is a normal phenomenon, does not belong to the precocious puberty, do not have to worry too much. In daily life, pay attention to pubic cleanliness and hygiene, change underwear, supplemental nutrition, and develop good living habits.