The first symptom of development in boys is the growth and development of the reproductive organs. The growth and development of the reproductive organs is an important manifestation of pubertal development in boys, which includes the morphology of the reproductive organs and reproductive functions. When a boy enters puberty, the testicles develop rapidly, the testicles and scrotum will continue to grow, the color of the scrotal skin will deepen, the folds will increase, the penis will become longer, and at the same time, the foreskin will gradually recede backward to expose the glans, and there may be cases of ejaculation. Developmental boy’s secondary sexual characteristics will also appear changes, the root of the penis appeared short, light-colored, fine soft pubic hair, at the same time there is a beard, armpit hair and other growth, the development of the laryngeal nodes increased, began to protrude, the width and thickness of the vocal cords increased significantly, the voice will become low. Boys development is a critical period of life, if you suspect that the development of abnormalities do not shy away from medical treatment, should go to the regular hospital in time for diagnosis and early treatment.