One-year-old babies shaking their heads may be caused by imitating other people, or it may be caused by other reasons such as vitamin D deficiency, eczema, and otitis media. 1. Imitation of other people: one-year-old baby shaking head imitation ability is relatively strong, if parents or other people shaking head in front of the baby, the baby may imitate other people will appear shaking head performance. 2. Vitamin D deficiency: Vitamin D deficiency is caused by insufficient sunlight, insufficient intake of vitamin D, chronic diarrhea and so on. Patients will appear night waking, excessive sweating, irritability, some babies will also appear shaking head and rubbing pillow. 3. eczema: one year old baby head eczema in the local sweating, sweat will stimulate the local skin caused by itching, so the baby will relieve the discomfort by shaking his head. 4. other: one year old baby shaking head is also considered to be otitis media, otitis externa and other diseases. One year old baby head shaking symptoms need timely medical attention, for the exclusion of physiological factors leading to the symptoms, parents need to take the baby to the doctor in a timely manner, you can choose the appropriate measures for treatment under the guidance of the doctor.