Mygym is suitable for children aged 0-8. According to children's physical and psychological development, * * * is divided into eight stages. The first stage is 6 weeks to 6 months, the second stage is 7- 13 months, the third stage 14-22 months, the fourth stage is 23 months to 2.5 years old, the fifth stage is 2.5 to 3.5 years old, the sixth stage is 3.5 to 4.5 years old, and the seventh stage is 4.5 to 6 years old.