The causes of eight-month-old children always shaking their heads include the following: 1, due to the symptoms of children suffering from head eczema. The child’s head eczema will cause itching of the head, thus causing involuntary shaking of the head, which can be treated with glucocorticoid ointment in time, such as the application of hydrocortisone ointment. 2. Symptoms caused by children suffering from vitamin D deficiency rickets. After a child suffers from vitamin D deficiency rickets, there will be more sweating in the occipital area, and the sweat will stimulate the child’s skin causing itchy scalp, and this time the child will also have involuntary head shaking, and can be supplemented with vitamin D and calcium gluconate oral solution.