Six months still not roll over may be rickets, motor function development backward and other factors, recommended to consult a doctor to clarify the diagnosis. 1. Rickets: Vitamin D deficiency can lead to rickets, vitamin D deficiency will affect the absorption of calcium, you can get more sunshine or take vitamin D and calcium tablets to improve. 2. Motor function developmental backwardness: generally speaking, a normal child can raise his head at three months, four months can turn over, six months can sit up, if the child can not turn over at six months, we should be alert to whether there is motor developmental backwardness exists 3. Other factors: If the child is fat and has a lot of clothes, which affects the child’s movement, it will be difficult for the child to roll over. It is recommended to consult a professional physician in time, after a clear diagnosis for professional treatment.