Infants shaking their heads in their sleep may be caused by higher temperature, eczema on the head, or hypocalcemia. 1. Higher temperature, if the temperature of the environment is higher during the baby’s sleep, it may cause the baby’s head to sweat, which may lead to head discomfort, and therefore may produce the symptoms of shaking head in the baby’s sleep. 2. Eczema on the head, if the baby has eczema on the head, the eczema may lead to itching and redness on the head, so the baby will shake his head in his sleep. 3. Hypocalcemia, if the baby’s body lacks calcium, it may cause the baby’s excitability to rise, and the baby will shake his head in his sleep, sweating and other reactions. There may be other reasons for babies to shake their heads in their sleep, so it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, and then give targeted treatment or therapy.