Four months baby sleep always shake his head reason

4 months baby sleep always shake his head, mainly caused by the following reasons: vitamin D deficiency rickets, the baby is generally sweating, irritability crying, pillow bald, easy to panic and other performance. Intestinal spasm, the baby has nausea, vomiting, loss of appetite, abdominal distension, diarrhea history. There are environmental factors, such as heat or excessive warmth, timely improvement of the environment, symptoms will improve.