Boys’ genitals grow even without reaching puberty. Generally speaking, the growth of boys’ genitals is roughly divided into two stages. From birth to 1 year of age, the genitals of boys will gradually grow to 3 ~ 4cm. after puberty, the genitals of boys will develop rapidly, penis growth, thickening, testicular volume, and then the emergence of pubic hair, beard, voice coarsening and other male sexual characteristics. If a boy’s genitals begin to develop at the age of 8 to 9, consider the phenomenon of precocious puberty. This is due to the presence of too many androgenic substances in the boy’s body, leading to early development, can go to the hospital for further examination, growth intervention and other treatments. Of course, if a boy’s genitals have not developed by the age of 15 or so, he may need to go to the hospital as soon as possible for a checkup to determine the cause of the problem. If a boy has a problem with his genital development, please do not make your own judgment and use medication, it is recommended to go to the hospital for diagnosis and treatment under the guidance of a doctor.