11 months old baby shaking his head, consider is due to physiological or pathological factors, physiological factors such as personal habits; pathological factors such as calcium deficiency, etc., can cause the baby to shake his head. 1. Physiological factors: 11-month-old babies grow and develop rapidly, and have a desire to explore the surrounding environment, there will be repeated shaking of the head, looking left and right; may also be the baby to learn adults shaking their heads to develop personal habits, there can be repeated shaking of the head performance. 2. Pathological factors: when the baby has a calcium deficiency, its nervous system excitability rises, easily irritable, so the symptoms of repeated head shaking when lying down; in addition, face and neck eczema, the baby touches the eczema will have a sense of pain, have no choice but to repeatedly shake his head to reduce the itchy feeling of eczema. 11 months old baby shaking his head, there may be other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.