Babies can’t tell you their head hurts, so spotting a concussion means watching their behavior closely after a bump or fall. The signs are different from what you’d see in an older child or adult, and some symptoms can show up hours or even days after the injury. Knowing what’s normal fussiness versus what signals a brain injury can help you act quickly when it matters.
Why Babies Are More Vulnerable to Head Injuries
A newborn’s brain is about 25% of its adult size, but the baby’s body weight is only about 5% of an adult’s. That means the head is disproportionately large and heavy compared to the rest of the body. When an infant falls or is struck, the head moves with more force relative to the neck and body than it would in an older child. The skull is also thinner and more pliable, with open fontanelles (the soft spots) and unfused sutures between the skull bones. Neck muscles and ligaments are still immature, offering less support. All of this makes the infant brain more susceptible to injury from what might seem like a minor bump.
Falls are the leading cause of head trauma in this age group, followed by motor vehicle collisions and pedestrian or bicycle accidents. In the United States, head trauma in infants and young children results in roughly 1,620 emergency department visits per 100,000 children each year. Most of these injuries are mild, but the challenge with babies is that “mild” is harder to confirm without careful observation.
Signs to Watch For
Because babies can’t describe symptoms like dizziness, headache, or blurred vision, you have to rely on behavioral and physical cues. According to the CDC, the key signs of concussion in children from birth to age 4 include:
- Unusual crying or irritability that goes beyond their normal fussiness
- Seeking more comfort than usual, like wanting to be held constantly
- Refusing to nurse or eat
- Sleep changes, either sleeping much more or much less than normal
- Loss of interest in play or usual activities
- Appearing dazed or confused, seeming more clumsy, or being unsteady on their feet (for babies who are walking)
- Vomiting shortly after the injury without another explanation like a stomach virus
- Behavior changes such as increased temper tantrums, sadness, or needing more help than usual
For babies old enough to talk, speaking more slowly than normal is another red flag. But for younger infants, the most telling signs are changes in feeding, crying, and alertness. You know your baby’s baseline better than anyone. The question to keep asking yourself is: “Is this how my baby normally acts?”
Danger Signs That Need Immediate Attention
Some symptoms after a head injury signal something more serious than a typical concussion, like bleeding or swelling inside the skull. Get emergency care if your baby:
- Will not stop crying and cannot be consoled no matter what you try
- Refuses to nurse or eat at all
- Loses consciousness, even briefly
- Has a seizure
- Has a noticeable swelling or soft spot on the skull that feels different than before (a bulging fontanelle can indicate increased pressure inside the head)
A swollen bump on the forehead after a fall is common and often looks worse than it is because the scalp has rich blood supply. But swelling in other areas of the skull, particularly on the side or back, is taken more seriously by doctors evaluating young children.
How Doctors Evaluate a Baby’s Head Injury
When you bring a baby to the emergency department after a head bump, doctors use a set of specific criteria to decide how serious the injury might be. For children under 2, the factors they assess include mental status (is the baby alert and responsive?), whether there’s a palpable skull fracture, whether the baby lost consciousness, how the injury happened, and whether you as the parent feel the baby is acting normally.
If the baby has an altered mental status or signs of a skull fracture, imaging with a CT scan is typically recommended because these children have a greater than 4% chance of a clinically important brain injury. On the other end of the spectrum, babies who have none of these risk factors have less than a 0.02% chance of significant injury, and a CT scan usually isn’t needed.
Many babies fall somewhere in between. They might have one risk factor, like a brief loss of consciousness or a large bump on the side of the head, but otherwise seem fine. In these cases, doctors often recommend a period of observation in the emergency department rather than immediately scanning. If symptoms worsen during that watch period, they’ll move to imaging. If the baby improves and stays stable, you may be sent home with instructions to continue watching.
Symptoms Can Be Delayed
One of the trickiest things about infant concussions is that symptoms don’t always appear right away. Your baby might seem perfectly fine in the minutes after a fall, then start vomiting or become unusually sleepy several hours later. UCSF Benioff Children’s Hospitals notes that children may not show symptoms until hours or days after the injury. This is why the observation period at home matters just as much as the initial evaluation.
For the first 24 to 48 hours after a head injury, pay close attention to your baby’s feeding patterns, sleep, mood, and activity level. Any new symptom that appears during this window, especially worsening irritability, repeated vomiting, or increasing sleepiness, warrants a call to your pediatrician or a return to the emergency department.
You Don’t Need to Wake Your Baby
One of the most persistent pieces of old advice is that you should wake a child every few hours after a head injury to make sure they’re okay. Current guidelines from both the CDC and the American Academy of Pediatrics say this is unnecessary for most concussions. Sleep actually helps the brain heal. Let your baby sleep on their normal schedule, keep their usual bedtime routine, and don’t prevent them from napping.
The one exception is if your child’s doctor specifically tells you to wake them at intervals, which they might do if the injury was more concerning or if certain symptoms were borderline. Otherwise, rest is one of the best things for recovery.
What Recovery Looks Like
After a concussion, the priority is giving the brain time to heal through both mental and physical rest. For a baby or toddler, that means keeping things calm and low-stimulation for at least the first 24 hours. Limit screen time and TV. Avoid highly active play like running, rough-housing, scooters, bikes, or anything with jarring motions. Quiet play with soft toys, books, or gentle music is fine.
This matters more than it might seem. A second impact to the brain while it’s still healing from the first concussion can be significantly more dangerous than the original injury. Even once your baby seems back to normal, hold off on rougher physical activity until your pediatrician gives the green light. Most children recover from concussions within a few weeks, but the timeline varies, and younger brains sometimes need more patience.
Don’t give your baby any medication to manage symptoms, including sleep aids or pain relievers, without checking with your doctor first. Some common medications can mask symptoms that would otherwise alert you to a worsening situation.