The baby four months will not turn over belongs to a common situation, if the baby’s own development is good, often due to lack of exercise, you can use toys to guide, practice arm support or with the help of auxiliary forces and other ways to guide the baby to turn over training. 1. The use of toys to guide: mother can be in the baby’s body with the sound of toys to tease him, inducing the baby to listen to the sound and look for the sound, and follow the sound of the roll over movement training. 2. Practice arm support: hang a colorful toy above the baby, let the baby’s two arms to support the body, head up to look for toys, so as to train the baby’s two arm support. The baby’s arms have enough support, will naturally turn over. 3. With the help of auxiliary force: mother can put the baby’s left leg under the right leg, auxiliary force. Let the baby’s body twist over, so as to roll over training. Mom does not have to be overly anxious, more training for the baby, the baby’s body is good, conducive to roll over. If necessary, you can visit a specialist clinic to learn more about your baby’s condition.