Babies can’t tell you their head hurts, so spotting a concussion means watching their behavior closely in the hours and days after a head impact. Symptoms typically show up within 24 hours, though they can sometimes take up to three weeks to appear. Knowing what to look for, and what counts as an emergency, can help you act quickly when it matters.
Common Signs in Babies and Toddlers
The CDC lists these as the key concussion indicators for children from birth to age 4:
- Crying more than usual or being unusually irritable
- Wanting to be held or comforted more than normal
- Refusing to nurse or eat
- Sleeping more or less than usual
- Losing interest in play or favorite activities
- Appearing dazed, confused, or unusually clumsy
- Vomiting right after the injury (without another cause like a stomach bug)
- Seeming unsteady on their feet (for toddlers who walk)
- Speaking more slowly than usual (for children who talk)
The tricky part is that many of these overlap with normal baby behavior on a bad day. What you’re looking for is a change from your child’s baseline. A baby who is always fussy is less concerning than one who is suddenly inconsolable after bumping their head. You know your child’s normal better than anyone, and that instinct is genuinely useful here. In fact, “not acting normally according to the parent” is one of the clinical factors doctors use when assessing head injuries in children under 2.
Red Flags That Need Emergency Care
Some symptoms after a head injury signal something more serious than a mild concussion, like bleeding or swelling inside the skull. Get to an emergency room or call 911 if your baby shows any of the following:
- Loss of consciousness, even briefly
- Cannot be woken up from sleep
- Will not stop crying and cannot be consoled
- Repeated vomiting (not just once)
- Seizures or convulsions
- One pupil that looks larger than the other
- Blood or clear fluid draining from the ears or nose
- Weakness on one side of the body
- Pale skin or excessive sweating
- A deep cut on the scalp or a soft, boggy spot on the skull that wasn’t there before
A soft, spongy swelling on the skull (other than the normal fontanel) can indicate a skull fracture. Doctors assess this by gently pressing along the scalp. If you feel something unusual, don’t press hard or probe it yourself. Head to the ER.
How the Fall Happened Matters
Doctors don’t just look at symptoms. They also consider how the injury occurred. For babies under 2, a fall from more than 3 feet (about 0.9 meters) is classified as a severe injury mechanism. That’s roughly the height of a changing table or a standard countertop. Other high-risk scenarios include car accidents with rollover or passenger ejection, and being struck by a fast-moving object.
A baby who rolls off a low couch onto carpet and cries briefly but then acts normal is in a very different risk category than one who falls from a high surface onto a hard floor. If the fall was from a significant height or involved a hard impact, it’s worth having the baby evaluated even if symptoms seem mild at first.
Why Symptoms Can Be Delayed
Concussion symptoms typically become noticeable within 24 hours, but the window can stretch to three weeks in some cases. This means a baby who seems perfectly fine an hour after a bump could start showing changes the next day or even later in the week. During the first 24 to 48 hours, pay close attention to feeding patterns, sleep behavior, mood, and alertness. If anything shifts noticeably, call your pediatrician.
One common worry is whether it’s safe to let a baby sleep after a head injury. Sleep is fine, and your baby may actually need more of it in the first few days. The concern isn’t sleep itself. It’s whether you can wake them up. Check on your baby periodically, and if they can’t be roused, call 911 immediately.
What Doctors Look For
When you bring a baby in after a head injury, doctors use a structured approach to decide how serious it is. For children under 2, they evaluate a specific set of factors: whether the baby’s mental status is normal (alert, not unusually drowsy or agitated), whether there’s a scalp swelling and where it’s located, whether there was any loss of consciousness and how long it lasted, how the injury happened, whether a skull fracture can be felt, and whether the parents think the child is acting like themselves.
If none of these risk factors are present, the chance of a serious brain injury is extremely low. A large validation study found that when all of these factors came back clear in children under 2, the rule correctly identified 100% of children who did not have a clinically important brain injury. This means doctors can often reassure you and send you home with monitoring instructions rather than ordering a CT scan, which is preferable since CT scans expose babies to radiation.
When risk factors are present, imaging may be recommended. The decision depends on how many factors apply and how severe they are.
Recovery at Home
If your baby is diagnosed with a concussion or sent home for monitoring, the first 24 to 48 hours are the most important recovery window. UCSF Benioff Children’s Hospitals recommends the following approach:
Keep your child calm and limit activity to quiet play for at least the first 24 hours. That means no running, rough play, scooters, or anything with jarring motions for toddlers. For babies, reduce stimulation: dim the lights, keep noise low, and minimize screen time. Stick to their normal sleep and nap schedule, but don’t be surprised if they’re sleepier than usual for the first few days.
Make sure they’re drinking enough fluids and eating well. For nursing babies, offer the breast or bottle frequently. Good nutrition supports brain healing. Avoid ibuprofen (Advil, Motrin) for the first 48 hours after the injury, as it can increase bleeding risk. Ask your pediatrician what’s safe for pain relief.
Plan to monitor your child for symptoms for at least two to three weeks. Most concussions in young children resolve fully, but watch for lingering changes in mood, sleep, feeding, or developmental progress.
Longer-Term Effects to Watch For
Most babies recover completely from a single concussion. However, emerging research shows that a subset of children who experience even mild traumatic brain injuries can have longer-lasting effects on thinking, emotions, and behavior. Brain imaging studies have found that some children show persistent changes in how different brain regions connect and communicate after a head injury, which may contribute to ongoing difficulties.
In practical terms, this means keeping an eye on your child’s developmental milestones in the months after a concussion. Are they hitting expected markers for motor skills, language, and social engagement? If you notice your child seems to be falling behind or behaving differently than before the injury in a lasting way, bring it up with your pediatrician. Early intervention for developmental delays is more effective the sooner it starts.