Infants shaking their heads and scratching their ears may be caused by physiological factors, as well as ear diseases, eczema, lack of vitamin D and calcium. 1. Physiological factors: If the baby shakes his head, shakes his head and scratches his ears without showing any other abnormal expressions, the vestibular system may be developing, which is a normal phenomenon. 2. Ear diseases: If the baby has otitis externa, otitis media and other diseases, the ear canal will have pain, itching and other discomforts, and the phenomenon of shaking head, shaking head and scratching ears will also occur. 3. Eczema: if the baby’s external auditory canal, ear skin, mucous membrane, scalp eczema, will make the baby feel itchy discomfort, caused by shaking head, shaking head, scratching ears phenomenon. 4. Lack of vitamin D and calcium: If the baby’s body lacks vitamin D and calcium, the nerve excitability increases, hyperactivity, irritability, sweating and other symptoms, in order to relieve the head sweating and other discomforts, the baby will appear to shake his head, shaking his head, scratching his ears. Infants are too young to express their discomfort normally, so parents should pay more attention to observation and seek medical treatment in time.