Turning over is normal from 3-5 months of age. Turning over requires good head control, shoulder joint induction, elbow joint extension, body axis rotation and lower limb induction to complete, and is a very advanced movement, which has a certain role in the overall movement coordination and intellectual development of the baby. In the process of baby turning over, we should pay attention to whether there is abnormal turning over, such as turning over with the head tilted back, the back of the arm is an abnormal phenomenon, we should pay attention to the possibility of brain injury, if necessary, you can do a cranial MRI examination.