Babies develop fever after vaccination because it's a normal part of the body's immune response.
Understanding Post-Vaccination Fever
It's understandable for parents to worry when their baby develops a fever after vaccination. However, according to research, fevers are a common and usually harmless side effect, indicating that the vaccine is working as intended and the baby's immune system is responding appropriately.
Here's a breakdown:
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Immune Response: Vaccines introduce a weakened or inactive form of a virus or bacteria (or just a part of it) into the body. This triggers the immune system to recognize the foreign substance (antigen) and create antibodies to fight it.
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Fever as an Indicator: The fever is a sign that the immune system is actively working. It's part of the body's natural defense mechanism to combat what it perceives as an infection (even though it's just the vaccine).
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Normal Reaction: Fevers after vaccination are typically mild and short-lived, usually resolving within 24-48 hours.
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Reference: As stated, "fevers are a normal part of immune responses" (04-Jan-2024).
Managing Fever
While fever after vaccination is generally not a cause for concern, here are some ways to manage it:
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Monitor the Temperature: Keep an eye on your baby's temperature using a reliable thermometer.
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Comfort Measures: Dress your baby lightly and ensure they are comfortable.
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Hydration: Offer plenty of fluids, such as breast milk or formula.
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Fever-Reducing Medication: If your baby is uncomfortable or the fever is high, you can consider giving them acetaminophen (Tylenol) or ibuprofen (Motrin) after consulting with your pediatrician. Follow the dosage instructions carefully.
When to Seek Medical Advice
While post-vaccination fever is usually mild, it's essential to contact your doctor if:
- The fever is very high (e.g., over 104°F or 40°C).
- The fever lasts longer than 48 hours.
- Your baby has other concerning symptoms, such as lethargy, poor feeding, difficulty breathing, or seizures.
