It is an important milestone for children to sit and an important symbol for the development of big sports. Generally, you start to learn to sit in about 6 months. Sitting alone for more than 6 months should be more stable. When you are close to 6 months old, you can start to learn to sit. At first, the baby may lean forward, and with the gradual formation of lumbar curvature, the sitting posture is relatively more stable. If children can't sit for more than 6 months, they will tilt or tilt when sitting. It is necessary to take the baby to the hospital in time for a comprehensive evaluation to see if there are any problems in large-scale sports development, so that some problems in the development of the child's nervous system can be found as soon as possible.