The male genitalia is about 8.8cm when it is soft and 12.9cm when it is erect is normal. Puberty is the peak period of genital development, you need to pay attention to good living habits, avoid excessive masturbation and other bad habits, appropriate exercise and reasonable diet, maintain good physical quality, to ensure the correct development of the penis. The size of the genitals varies greatly from person to person, if there is no developmental problem, there is no need to pay too much attention to the size of the problem, if there is a problem with the development of the genitals, it is necessary to consult a doctor in a timely manner. If there is any physical discomfort, it is recommended that the patient go to the hospital in time to clarify the condition and standardize the treatment under the guidance of the doctor.