11-year-old boy development will still grow taller, 11-year-old development is normal will not affect the height. The boy’s sexual development begins at the age of 11~13 years old, there will be a gradual increase in testicular enlargement, the emergence of armpit hair, pubic hair, penis enlargement and thickening, voice thick and heavy, facial whiskers and other characteristics, marking the beginning of puberty. When the secondary sexual characteristics begin, that is, 1~2 years after the beginning of puberty, there will be a rapid increase in height and weight, that is, the second growth spurt, the second growth spurt growth is 15% of the final height. At this time, appropriate supplementation of calcium, vitamin D, phosphorus and other nutrients, balanced and sufficient nutrition, to ensure adequate sleep, appropriate physical exercise.