The baby sleeps with his head tilted back may be a physiological phenomenon, or it may be caused by pathological factors, such as brain dysplasia, congenital brain defects, etc. The baby’s head may be tilted back when he sleeps. 1. Physiological phenomenon: the baby is relatively small, the physical development is not very perfect, the neck muscle control ability is relatively poor, may appear to sleep to the back of the phenomenon. In addition, the baby pillow discomfort, to the baby sleeping posture is not correct, cervical spine discomfort, will also lead to sleep backward, mostly normal phenomenon, generally do not need special treatment. 2. Pathological factors: the baby’s brain dysplasia, congenital brain defects, etc., will lead to increased muscle tone, head tilt, easy to startle and other symptoms. Under the guidance of the doctor to help the baby more exercise, such as lifting the head, twisting the head, etc., to improve the relief. It can also be improved by appropriate massage. The baby sleep head to the back tilt should be timely medical treatment, in addition to the exclusion of physiological phenomena, symptomatic treatment, so as not to delay the condition.