unusual sleepiness and/or difficulty staying alert.a dent or bulging soft spot on the skull.If your baby is showing any of these symptoms after experiencing an injury to their head, call 911 or take them to the nearest emergency room immediately: That said, it’s still important to be aware of the symptoms of a traumatic brain injury, including concussions, which usually present within 24 to 48 hours of the accident. Only about 1 percent of skull fractures related to accidental falls cause moderate to severe brain injury. When to get emergency medical help after your baby bumps their headįirst, some reassuring stats: According to one study on short falls in young children, only about 2 to 3 percent of falls lead to a simple linear skull fracture, and most of these don’t cause neurological problems.