Four-month-old babies sleeping on the wrong side of the head can usually be corrected. Baby sleeping on the wrong side of the head and the baby’s sleep posture has a certain relationship, in general, the skull shaping period within 12 months, four months of the baby’s skull and the cranial suture has not completely closed, can be corrected, and the earlier the correction of the effect the better, if more than 12 months, the chance of correction is relatively small. Four months of the baby’s head sleep deviation can be corrected by changing the sleeping position, if the baby sleeps often head to one side, can be corrected from the usual habits, such as parents to guide the baby’s head to the other side, usually hold the baby should pay attention to not use one hand to hold, can be alternated between left and right to hold the baby. When the four-month-old baby sleeps, parents should pay attention to adjust the baby’s sleeping posture, usually to strengthen the nutritional intake, more vitamin D and calcium supplement.