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Fever in Babies After Vaccination - An Overview

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Vaccination helps in reducing the potential risk of various diseases. However, many myths are associated with vaccination among the parents of children.

Written by

Dr. Kriti Singh

Medically reviewed by

Dr. Bhaisara Baraturam Bhagrati

Published At November 18, 2022
Reviewed AtNovember 18, 2022


Vaccination is one of the most effective ways to reduce children's risk of serious illness. Children are more prone to diseases such as measles, rubella, mumps, polio, and diphtheria. Vaccination has side effects. One of them is fever. It can be painful and uncomfortable for a child. Fever is part of the immune response, so after vaccination, a child's immune response is. Vaccination builds immunity in the body against viruses and bacteria.

What Are the Functions of Vaccines?

Vaccine builds the immune system of the child against microorganisms. In vaccination, a minimal component of microorganisms is introduced into a child's body to build immunity. Various symptoms are seen in children due to immune responses such as fever, rashes, etc. It creates the immune system of the child.

Why Do Vaccines Cause Fever?

The average body temperature is ninety-eight degrees Fahrenheit. Fever is defined as a rise in body temperature average. Physiologic body temperature varies among various populations and within a time range. Fever is associated with disease but is a significant part of the immune response. Fever helps in activating response to fight against germs.

Is Fever After Vaccination Normal?

Some children acquire a very high fever after vaccination. Fever is suggestive of the immune system responding against the vaccine. If the fever is mild, parents should not get worried; instead, they should learn the practice to soothe the child. However, in some cases, the shield did not get a fever after vaccination. In this situation, parents should not get worried because every child's body's immune response is different.

How Does Fever Appear After Vaccination?

  • Fever can occur within 24 to 48 hours of vaccination, which requires symptomatic treatment like cold compression at the injection site and Paracetamol as an antipyretic. Vaccines build immunity in the body against pathogens in various ways. Vaccines are made up of microorganisms. It is injected into the body in significantly fewer amounts. It activates the immune system, due to which inflammatory markers are produced. It results in swelling and fever. In addition, there is a presence of tenderness at the site of injection. All these symptoms are a response to inflammatory markers produced by invasion by the microorganism. Therefore having a mild fever is considered an excellent immune response.
  • Adverse reactions to vaccination can include fever and other symptoms from the same day of vaccination till seven days post-vaccination, which must be reported to a healthcare professional for documentation and reporting purposes.

What Are the Typical Reactions of the Body Against Vaccines?

Vaccines are meant to protect the child from illness; however, they have various side effects. These reactions caused by vaccines are normal and harmless. The primary function of a vaccine is to produce proteins in the blood known as antibiotics. If the child is vaccinated for any particular disease, they start building immunity against the microorganism causing that disease. Suppose there is a presence of mild reactions in the body after vaccination. These mild reactions represent that the vaccine is working in the child's body. These reactions are self-healing.

The following are the effects seen after the vaccination.

  1. Tenderness at the sight of injection.

  2. Redness at the sight of injection.

  3. Swelling at the site of injection.

  4. Mild to moderate Fever.

  5. Fussy behavior of a child.

  6. Unable to sleep.

  7. Vomiting.

  8. Drowsiness.

  9. Loss of appetite.

How Should Parents Take Care of Their Child After Vaccination?

Vaccines cause a lot of pain and discomfort to the child; therefore, parents must take care of their children properly. Even after the one dose of the vaccine, the child is scared of needles due to pain and discomfort. Therefore it's the parent's responsibility to take care of their children and manage to soothe them.

Following are the few methods parents should follow.

  • Feeding and Cuddles - Parents should try to offer feeding and cuddles to their children. Parents should nurse their children while holding them on their lap. Parents can give a sucking pacifier dipped in a sugar-water solution. Physical comfort and pacifiers can help your young children.

  • Request a Topical Anesthetic - If the baby feels restless due to pain, parents should ask their pediatrician for a topical anesthetic. The topical ointment should be applied to the skin where the vaccine is injected. If the child is non-cooperative, the area where the vaccine is injected should be desensitized.

  • Parents Should Be Calm - Parents should be relaxed. The child usually gets restless after the injection of the vaccine. The parents should get anxious if the child starts crying; instead, they should have the patience to handle their child.

  • Try a Baby Massage - Parents should apply deep pressure to the area immediately after the injection. It helps in reducing pain and muscle spasms.

  • Swadling - Parents can swaddle their children by wrapping them tightly in a blanket. The baby's leg should constantly be exposed after vaccination. The child should try to be placed on the side or stomach.

  • Swinging - Parents can turn their children in arms. It helps distract the baby.

  • Sucking - A child can be distracted by sucking pacifiers and breastfeeding.

  • Clothes - The child should not be layered with clothes. Instead, the clothes should be light and comfortable.

  • Fluid Intake - Parents should give plenty of fluids to the child. It helps in reducing the dehydration of the body.

When Should Parents Call the Pediatrician?

If the side effects after the vaccination are severe, parents should seek a visit to a pediatrician as soon as possible.

Following are the signs which represent a child's needs in health care.

  1. Fever is higher than one hundred Fahrenheit.

  2. Extreme fatigue and restlessness.

  3. Pain in the limbs, ears, and stomach.

  4. The difficulty in swallowing.

  5. Vomiting.

  6. Diarrhea.

  7. Drowsiness.

  8. If the fever persists for more than four days.


The vaccine helps in building a child's immunity. It helps in protecting the child from dangerous diseases. Vaccination helps in reducing the chances of life-threatening illness and their complications. It lowers the risk of infection and thus helps in building lifetime immunity. Vaccination should be practiced on schedule. Health visit Instead of worrying about the potential side effects of a baby's vaccines, try to gather knowledge with a pediatrician. Parents do get worried, looking at their children in pain and crying. However, a parent should know to soothe their child. The love of warmth of parents helps the child to feel calm.

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Dr. Bhaisara Baraturam Bhagrati
Dr. Bhaisara Baraturam Bhagrati



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