Symptoms of development in boys include signs of sexual development (e.g., enlarged testicles, penile development), weight and height gain, and the appearance of secondary sexual characteristics (e.g., low tone of voice, protruding laryngeal nodes, and growth of whiskers). 1. Signs of sexual development: testicular enlargement and penile development will occur in boys. Boys’ sexual development is more subtle and needs to be monitored continuously after the age of 9. 2. Increase in weight and height: the body enters the 2nd peak of height growth, which is a distinctive feature of puberty, and there is a period of sudden increase in height, when the secretion of growth hormone increases to promote bone growth, which is manifested by a significant increase in weight and height. 3. Secondary sexual characteristics: the appearance is more obvious, such as the gradual development of the reproductive system maturity, height and weight close to the adult, the appearance of low pitch, prominent throat knot, long beard and other secondary sexual characteristics of the male body. Boys development is genetic, nutritional, environmental, behavioral and other factors are integrated, and therefore need to pay more attention, in the developmental period of adolescents recommended that parents pay close attention to its growth changes, if necessary, hospital consultation, to protect the healthy growth of children.