1. Observing the child's sitting posture: First of all, we must understand the child's wrong sitting posture, observe whether his sitting posture is correct, and whether there are problems such as hunchback, bow and sideways.

2. Correct the wrong posture: When the child's wrong sitting posture is found, it should be corrected in time. You can gently press your child's back with your hand to keep them in a posture of holding their chest high and holding their heads high. At the same time, through oral reminders and demonstrations, let children learn to sit correctly.

3. Increase the activity time: Keeping the same posture for a long time can easily lead to muscle fatigue and bone deformation. Therefore, let children do more outdoor activities, increase exercise and promote physical development.

4. Provide suitable seats: It is also important to choose suitable seats for children. The seat should conform to the principle of ergonomics, support the child's waist and back, and make the child sit comfortably and naturally.

5. Cultivate good habits: Finally, help children develop good sitting habits. Relevant regulations and reward and punishment measures can be formulated in the family to encourage children to adhere to the correct sitting posture and gradually form good habits that they consciously abide by.