Babies like to sleep with their heads tilted up may be a normal physiological phenomenon, or calcium deficiency, upper motor neuron injury, etc.. Infants’ neck development is not yet fully mature, the support is weak, it will appear tilting the head to sleep, if not accompanied by other symptoms, no special treatment, with age, the neck muscles will gradually develop, the muscles will become more and more powerful, tilting the head to sleep the symptoms will also slowly disappear. If the infant’s bones are not well developed due to calcium deficiency, the neck will not be able to support the head sufficiently, and the symptom of sleeping with the head tilted back will occur. Upper motor neurons are the motor neurons above the motor cells in the anterior horn of the spinal cord. If upper motor neuron damage occurs in infants, the effleurage will be weakened, the muscles will be toned, and the infants will develop the habit of frequently tilting their heads and sleeping on their backs. Babies like to sleep on their backs, there may also be other reasons, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or therapy.