The child’s forehead knocked a big bag, if the spirit is okay, no vomiting and other abnormalities, considered a minor head trauma, you can give the baby with cold compresses to reduce the swelling, if the child’s forehead knocked a big bag, but also poor spirit, jet vomiting and other abnormalities, do not rule out the possibility of traumatic brain injury, to go to the public hospital pediatric clinic for further consultation and treatment. Head trauma is generally caused by sharp objects or trauma, manifested as a local lump, the child may feel pain and discomfort, generally within 24 hours it is recommended to use cold compresses to reduce swelling, such as ice or cold potato slices cold compresses to reduce swelling, after 24 hours it is recommended to use hot compresses to remove blood stasis, such as hot towels can be used locally hot compresses; traumatic brain injury is due to brain damage caused by external forces, the consequences of this, such as The emergence of speech, sensory, visual, hearing and other abnormalities, serious cases can even appear impaired consciousness, respiratory and cardiac arrest and death. Therefore, the child’s forehead knocked a large bag, pay attention to observe the child’s state of consciousness, and whether there is vomiting and other abnormalities, if the child is all normal, generally speaking, the problem is not big, home attention can be observed, if the child appears poor mental, vomiting and other abnormalities, to promptly seek further medical treatment, so as not to delay the disease.