How can a fontanel be affected by a head injury?

A fontanel, or soft spot on an infant's skull, can be affected by a head injury through increased pressure or trauma to the area. If the injury causes swelling or bleeding within the skull, it can lead to bulging of the fontanel, indicating potential intracranial pressure. Conversely, a significant head injury might cause the fontanel to appear sunken, suggesting dehydration or other complications. Monitoring the fontanel's condition after a head injury is crucial for assessing the child's health.