Causes 5 months old baby like to shake his head quickly cause is multifaceted, such as have sleep uncomfortable, head skin itchy, body language expression, behavior imitation, disease factors are caused by like to shake his head quickly. If the baby appears to shake his head quickly before going to bed, parents should look at whether the indoor temperature is too high, too much quilt cover or pillow is too hard, uncomfortable padding and cause, do not use adult pillows need to use special pillows for babies, preferably with cotton can absorb sweat material. Itchy skin on the head is also the reason why babies like to shake their heads quickly, because babies sweat more, the back of the head is stimulated by sweat, the skin on the head will itch, the baby will shake his head quickly to relieve this itch. Some babies like to shake their heads quickly is also a kind of body language expression, because the baby can not speak, so when happy or irritable will shake their heads quickly to express their mood, can shake their heads more than a dozen times in a row, lasting 5-6 seconds. 5 months old baby already has its own consciousness, so there will be behavior imitation, when you see adults shaking their heads, the baby may consciously imitate the phenomenon of rapid Shaking head phenomenon. These are normal phenomena, so mom and dad don’t have to be too anxious and worried. But if the rapid head shaking lasts for a very long time and is accompanied by other abnormal phenomena, such as convulsions, rolling eyes and other symptoms, you need to go to the hospital for examination to rule out epilepsy or other diseases that cause it.