In life, careful moms and dads often find that three-month-old babies often shake their heads in the process of sleeping, so what causes babies to shake their heads? Is the baby lack of calcium? First of all, we must clarify that the phenomenon of shaking the head when the three-month-old baby sleeps is in most cases a normal physiological phenomenon. As the baby grows up, the muscles and bones of the baby’s head and neck develop, the movement of the head will gradually increase, so the movement of shaking the head will also increase than before, at the same time most children do not turn over, usually in a flat position, but also more likely to shake their heads. Of course, there are some cases may be pathological performance, so we also need to exclude some diseases, for example, if the baby has a more obvious eczema, may be due to local rash resulting in local itching symptoms, thus sleep will feel very uncomfortable, shaking head movements, need to actively treat the symptoms of eczema. If your baby has an upper respiratory tract infection with fluid coming out of the ears on both sides, you need to be alert to the possibility of otitis media, which may also cause your baby to shake his head if he has ear discomfort. Another common situation is that if the baby sleeps too much, the baby is too hot, the head and neck sweat more, also because the sweat stimulates the local skin, resulting in local itching out of the phenomenon of shaking head. The last one is what we often call vitamin D deficiency rickets, which is often called calcium deficiency. When the baby sleeps, the sweat may cause stimulation to the skin at the back of the occipital area, resulting in the phenomenon of shaking the head. . To sum up, the phenomenon of shaking the head of a three-month-old baby sleeping is not necessarily caused by calcium deficiency. We should carefully observe the child’s performance, combined with the child’s specific performance, specific analysis of the problem, to confirm the cause of head shaking, to give symptomatic treatment.