The development process of pediatric penis is mainly divided into three stages, 0-1 year old, 1-10 years old, after 10 years old. 1.0-1 years old, this time the boy’s penis is in the stage of rapid development, the penis in the state of weakness can reach 3-4 centimeters, but pay attention to the boy’s weight, must not be too obese, excessive obesity will lead to the accumulation of fat in the belly, so that the length of the penis is greatly shortened, the foreskin wraps the glans and affects the development. 2.1-10 years old, boys in 1-10 years old or puberty, the penis will not have obvious development, some boys puberty may be 14 years old, during this period, the boy’s urination is normal, the glans can be turned out, parents do not need to intervene too much, the normal growth of the good, the same during this period to pay attention to the boy’s body weight, obesity will affect the development of the penis. 3. After the age of 10, or after puberty, the penis will develop rapidly, growth and thickening, due to pigmentation, the penis color will also deepen. If after the age of 10, or after puberty, the boy’s penis, testicles and scrotum have not yet developed, you need to go to the hospital for examination, to clarify the causes of delayed development, and treatment under the guidance of the doctor.