The baby angry hit his own head, usually physiological reasons, in addition there may be autism and other pathological conditions. 1. Physiological reasons: small babies angry often appear some physical over-excited behavior, throw things or slap objects, some small children will appear to slap their own head to vent their anger. 2. Autism: the baby will show inattention, too much activity or stereotyped repetitive movements, language development is significantly behind children of the same age, emotional impulsivity, anger can be manifested when the head hit the wall or pat his head and other undesirable behaviors, and it is difficult to appease. Baby angry hit his own head, there may be other reasons, it is recommended to go to the hospital in time to improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.