In September, when most children enter the park, it is inevitable that there will be an adaptation process. Many children will cry, and some children will cry by themselves. When others are crying, they will also cry inexplicably. Some children cry for days, while others cry for weeks. If they drink less water, they will get sick easily, so many children will get sick when they first enter school in autumn.
Your child is a little younger. If your child is not as sophisticated as his peers, you might as well wait a few months until everyone has cried enough, then get used to it and formally enter the park in spring.