1, baby refers to a one-year-old baby called a baby. It has been one year since the baby was born. Its height should reach 75cm, its weight should reach 10kg, and its head circumference should reach 46cm. The fontanel of the front fontanel is almost closed, usually 12- 18 months.

2. There are also three physiological bends formed by children's sports development, which grow particularly fast within one year after birth, and then the growth rate lags behind the growth of body length.