5-month-old babies always shake their heads when they sleep, which is considered to be caused by physiological factors, but it may also be caused by other pathological phenomena, such as eczema, lack of micronutrients and so on. According to other accompanying symptoms, comprehensive analysis is needed: 1. Physiological phenomenon As the nervous system as well as the muscles of 5-month-old babies are not yet fully developed, head shaking may occur during sleep. This may be because the baby has not yet entered deep sleep, usually after the baby is asleep, it can be relieved, do not worry too much. 2. Pathological phenomena (1) Eczema: If the baby has eczema, especially the skin on the head, there will be itching. In this case, the baby is always shaking his head after falling asleep may be due to localized itching, you can pay attention to the baby’s skin, and after finding eczema, go to the regular hospital in a timely manner. (2) lack of micronutrients: baby if lack of micronutrients, especially the baby lack of calcium, will affect the quality of sleep, which will lead to the phenomenon of shaking head. Prompt medical consultation is needed to observe whether the baby’s body suffers from calcium deficiency. If calcium deficiency is diagnosed, calcium should be supplemented in time. When the baby has the above symptoms, it is recommended to consult the doctor in time and correct them under the doctor’s guidance.