Infants always shaking their heads may be caused by normal physiological phenomena, vitamin D deficiency rickets, eczema, otitis media and other causes. 1. Normal physiological phenomenon: because the development of the infant’s nervous system is not perfect, may often appear tremor, and then shake their heads. But there will be no other abnormal symptoms, which is a normal physiological phenomenon. 2. Vitamin D deficiency rickets: Sweaty babies will feel itchy and shake their heads, especially when babies suffer from Vitamin D deficiency rickets, due to sweating, which stimulates the skin of the baby’s head, so they keep shaking their heads. 3. Eczema: if the baby suffers from facial eczema, it will feel itchy, because it will not scratch, so it can only shake its head to rub the itch. 4. Otitis media: It may be that the baby spit up milk into the ear, triggering otitis media, due to the pain or itching of the ear, so the phenomenon of shaking the head. Babies always shake their heads in the exclusion of normal physiological factors, should be timely to the hospital, please doctor clear diagnosis and treatment.