Infant head-banging may be caused by physiological factors, or it may be triggered by problems such as eczema and calcium deficiency in the head. 1. Physiological factors, infants may have abnormal behavior when they are more excited, so they may have head-banging reaction, which is a way for infants to express their excitement. 2. Eczema on the head, some infants have eczema on the head due to more small rashes on the head, which may lead to itching symptoms, at this time the infant is not very comfortable and may appear to hit the head of the infant symptoms. 3. Calcium deficiency, if the baby body lacks calcium, may lead to excessive sweating, nervous system excitability, so the baby will appear head beating symptoms. There may be other reasons for infants to beat their heads, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, and then give targeted treatment or treatment.