It is very common for infants to have a bump on the head. Parents need to check carefully if there is any obvious skin rupture or bleeding in the injured area, and if the bump is gradually increasing, if the bump is getting bigger and bigger, and even if the child appears unconscious, coma, drowsiness, or even jet vomiting, you need to go to the hospital as soon as possible for a head CT examination to clarify whether there is active intracranial bleeding. If the mental state is good, the child can be closely observed at home first, and the area where the bag is raised can be applied locally with cold compresses, and after 48 hours, it can be changed to local hot compresses.