I, the normal development of the turn over prone position 5.8 months can turn over from prone to supine position 6.0 months can be supported by both arms, can lift the head and chest at least 90 ° 6.1 months can turn over from supine to prone position II, the method of training turn over pelvic control turn over: baby supine position, parents hold the baby’s calf, bend the side of the hip and knee drive the pelvis, such as turning to the left, the right lower limb flexion, baby’s body to Left side of the rotation, after down flexion side of the calf, baby turn over to the prone position; turn over from the prone position to the supine position as well. Note: When turning over, remember to put the baby’s hand to the side of the head to avoid injury during the turning process. Shoulder-controlled turning: baby in the supine position, parents hold the baby’s arms up over the head with both hands, and then cross the arms left and right, so as to drive the baby’s body to turn over; from the prone position to the supine position as well.