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男孩子到了十一二岁,随着身高、体重迅速增长和睾丸、阴囊的增大,第二性征也会逐漸出现。有人把男性生殖器官和第二性征的正常发育分为五个阶段:①10岁以前,睾丸容积仅有1～3毫升,第二性征不明显;②10～11岁左右,睾丸和阴囊增大,阴囊皮肤皱褶增多,颜色淡红,有稀少很短的阴毛生长;③12～13岁左右,阴茎增长、变粗,阴毛细少变多、长粗、变黑、卷曲;④14～15岁左右,阴茎和阴囊进一步长大,阴囊色泽加深,阴茎头充分发育,阴毛呈男性的菱型分布;⑤16～17岁左右,外生殖器形状和大小与成人相似,接近性成熟。
The boy arrives eleven or two years old, with the rapid increase of height and weight, and the increase of testicles and scrotum, the second character will gradually appear. Some people put the male genital mutilation and secondary development of the normal development is divided into five stages: ① 10 years ago, testicular volume is only 1 to 3 ml, the second sex is not obvious; ② 10 to 11 years old, increased testis and scrotum , Scrotal skin folds increased, the color of red, there is a very short sparse pubic hair growth; ③12 ~ 13 years old, the penis grows, thicken, less pubic hair thin, long thick, black, curly; ④14 ~ 15 years old , The penis and the scrotum further grow up, the scrotum color deepening, full development of the penis, pubic hair was male distribution of diamond; ⑤ 16 ~ 17 years old, genital shape and size similar to adults, close to mature.