What is the period of most rapid growth and development in children?

The two key periods of most rapid growth and development in children are as follows: 1. Infancy: From birth to one year of age, this is the first peak period of growth in children. During this year, children's height increases by an average of about 25 cm, and weight increases by approximately 7–8 kg, with particularly rapid growth occurring in the first three months. 2. Puberty: Around ages 11 to 16, especially between 12 and 14 years, children enter the second phase of rapid growth and development. Puberty is a crucial period when children develop secondary sexual characteristics and progress toward reproductive maturity. During this time, girls typically grow about 22–25 cm, while boys grow about 25–28 cm. These two periods are critically important for children's height, weight, and overall healthy development. Therefore, parents should pay special attention and provide necessary nutritional support and health guidance.