It is generally normal for boys to start growing a beard and penis at the age of 11. Boys generally in 11 ~ 13 years old began to enter puberty, the emergence of secondary sexual characteristics, manifested in rapid growth in height, testicular volume increase, penis growth and thickening, the emergence of beard, pubic hair and so on. These are all normal phenomena of puberty, this time you need to pay attention to timely supplementation. Due to the rapid development of various organs during puberty, it is necessary to do a good job of children’s education, guide children to correctly recognize these physical changes, and do a good job of sex education guidance, at the same time, it is also necessary to timely replenish the various nutrients needed to avoid affecting the normal growth and development, but also need to strengthen the exercise. If you find any abnormality in the development of boy’s fertility, please consult the regular hospital in time.