4 months old baby sleep always head shaking around, need to consider sleep tightly wrapped, calcium deficiency, poor gastrointestinal function. 1. Pillow sweat, if the sleep package is tight, the baby sweats more, the head contact position is moist, resulting in the child’s head shaking around friction, caused by the occipital hair loss, the formation of occipital baldness. 2. Calcium deficiency will cause the child sleep is not solid, sleep head shaking around, and easy to wake up, is also caused by occipital hair loss of one of the reasons. 3. Poor gastrointestinal function, the baby’s abdomen is cold or eat too much before going to bed, dyspepsia, bloating discomfort, can also cause poor sleep. Once in a while do not need to worry, if usually often like this, it is recommended to take the child to the hospital to clarify the cause.