Head upright Developmental sequence: prone position 1 month Repeated head lift for at least 3s; 2 months Head lift 30°~45°, hold for 10s; Guangdong Maternal and Child Health Hospital, Department of Child Neurological Rehabilitation, Huang Smart 3 months Elbow support head lift 45°~90°, hold for 1min; sitting position 1.2 Keep head upright in sitting position for 8s; 3.7 Raise head when sitting, head does not hang back and hold for 30s; 3.8 Sitting position can Significance: 1. Head lifting in prone position is the first milestone movement in the developmental process of children; 2. 2, abnormal tension of neck muscles and trunk muscles. 3, weakness of the neck muscles or imbalance in the strength of the muscles.