Three months baby head vertical instability can be seen in malnutrition, can be appropriate supplementation of vitamin D and protein; may also be seen in neonatal hypoxic ischemic encephalopathy, this time to give oxygen therapy, rehabilitation training and other treatment. 1. malnutrition: if the baby low calcium and low protein will cause the baby head up unstable, this time you can give the baby appropriate amount of vitamin D and protein supplement, go to the plains more sunshine, is conducive to the growth and development of the baby’s bones. 2. Neonatal hypoxic ischemic encephalopathy: at this time the baby’s muscle tone is low, there may also be head erect instability, can take the baby to improve the blood gas analysis, head MRI, electroencephalogram and other related examinations, a clear diagnosis of the earliest possible after the line of intellectual and physical rehabilitation, is conducive to promoting the recovery of brain function, to reduce the sequelae. Three-month-old babies head erect instability may also have other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor targeted treatment.