Five and a half months baby sleep always shaking his head, generally the following reasons: 1, the baby sleep is not the quilt cover too thick, if the quilt cover too thick to cause the baby is too hot and uncomfortable, will not stop shaking his head, moving. 2, the baby suffers from eczema, especially the back of the head, neck eczema, the baby will shake his head to relieve the discomfort of the itchy skin. 3, the hair is not washed, the baby’s head has dandruff Or foreign objects, can also cause head itching, prompting the baby sleep shaking head. 4, calcium deficiency, baby calcium deficiency will appear shaking head, rubbing pillow, night crying, sleep restless symptoms.