Six-month-old babies still can not turn over may be too obese, lack of calcium and central nervous system dysplasia and other causes. 1. too obese: when the six-month-old baby is too obese, excessive accumulation of adipose tissue, it will cause obstacles to the body, the phenomenon of not turning over. 2. lack of calcium: baby turn over is also need strength, if the muscle weakness, bone calcium, will feel the movement is difficult, will lead to six months baby will not turn over the situation. 3. Poor central nervous system development: If the baby has a history of intrauterine hypoxia, it will lead to the development of the baby’s central nervous system is affected, affecting the subsequent motor development, the phenomenon of six months still can not roll over. When a six-month-old baby can’t roll over, and there are other delays in the development of large and fine motor skills, it is recommended that the baby be taken to the pediatrician for examination and treatment according to the cause of the disease.