It is normal for babies not to roll over at 3 months. Generally 3 months old babies, because there are individual differences in babies, some babies will not roll over at 3 months is normal, parents can give the baby to strengthen the training. Three months the baby will not roll over, parents can look for reasons, for example, the baby does not love to move and do not love to roll over, or family members are always holding the baby, did not give the baby to create the opportunity to roll over, resulting in the baby will not turn over and so on. In addition, you can target to do some training, such as bed to the baby after dressing or bathing, teasing with toys to make the baby turn over sideways, or turn into a prone position. You can also put the baby on the cot sheet, in the case of perfect protection, parents in the baby’s two ends of the cot sheet to grasp the left and right to roll the baby, so that the practice of turning over to become a game. Practice more often to familiarize the baby with the sensation of rolling over. If necessary, you can go to the child health department, follow the doctor’s advice to be targeted training.