Should You Delay Vaccination After Your Baby Hits Their Head? - Pediatrics

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The baby bumped the back of their head?


Doctor, my baby fell while walking and hit the back of his head.
He cried a lot but is now active and everything seems normal.
He is scheduled to receive the second dose of the Japanese encephalitis vaccine in two days.
Should we postpone the vaccination? If so, how long should we delay it? Also, when a baby hits their head, should we observe them first or take them to the hospital right away? Thank you.

Pei Tong, 20~29 year old female. Ask Date: 2015/11/25

Dr. Xiao Kaiwen reply Pediatrics


If there are no immediate discomfort symptoms, observation can be done first.
Pay attention to any signs of excessive crying or irritability that cannot be soothed, persistent significant vomiting, lethargy with altered consciousness, weakness or paralysis in limbs, or even seizures.
Generally, acute intracranial hemorrhage should be monitored for 3 days (chronic intracranial hemorrhage is rare in infants and young children).
If there are no discomfort symptoms, routine vaccinations can still be administered on schedule.

Reply Date: 2015/11/25

More Info


When a baby experiences a head injury, such as hitting the back of their head after a fall, it is essential to assess their condition carefully before proceeding with any vaccinations. In your case, since your baby cried initially but then returned to normal activity, it is a positive sign. Generally, if the child shows no immediate concerning symptoms—such as persistent crying, vomiting, lethargy, confusion, weakness, or seizures—observation is often the first step.

For vaccinations, the current medical consensus suggests that if the child is stable and exhibits no concerning symptoms, it is typically safe to proceed with the scheduled vaccinations, including the Japanese encephalitis vaccine. However, it is always prudent to consult with your pediatrician or healthcare provider for personalized advice based on your child's specific situation.
In terms of timing, if there are no symptoms of a concussion or other complications, you likely do not need to delay the vaccination. If any concerning symptoms develop, it would be wise to postpone the vaccination until a thorough evaluation can be conducted. The general recommendation is to observe the child for at least 24 to 48 hours after the injury, as some symptoms may take time to manifest.

Regarding whether to observe or seek immediate medical attention after a head injury, the decision largely depends on the severity of the injury and the child's behavior following the incident. If the child appears to be functioning normally—playing, eating, and sleeping well—observation is usually sufficient. However, if there are any signs of distress or abnormal behavior, it is crucial to seek medical attention promptly.

In summary, if your baby is active and showing no signs of distress after the fall, you can likely proceed with the vaccination as planned. However, always err on the side of caution and consult your healthcare provider if you have any doubts or if your child's condition changes. Regular monitoring of your child's behavior and health following a head injury is essential to ensure their well-being.

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