Boys generally develop pubic hair first.
Generally after boys enter puberty, with the secretion of androgens in the body, the vulva gradually matures, which will lead to the enlargement of the testicles. Boys will begin to appear secondary sexual characteristics, further development of external genitalia, and then slowly begin to grow pubic hair, testicular development is accompanied by the emergence of pubic hair growth, generally boys 10 to 12 years old began to appear the growth of pubic hair.
Boys’ hair growth includes armpit hair and pubic hair, which grows with the sex hormones secreted by the gonads. For boys, the appearance of armpit hair is usually 1 to 2 years later than pubic hair, and armpit hair is one of the signs that a child has entered puberty.
If a boy is 16 years old and has not grown pubic hair and armpit hair, he must go to the hospital to find out the cause and further treatment.