Fever and Care After Vaccines

Introduction

A mild fever after vaccines may be related to the immune system responding, and it is seen in many babies. It usually doesn't last long. Still, keeping an eye on the fever and giving the right care are important.

What Is Normal After Vaccines?

Mild fever
Redness and tenderness at the injection site
Fussiness, a brief loss of appetite
A temporary change in sleep patterns

What Can Parents Do?

Dress your baby lightly and keep the room cool and calm
Keep feeding breast milk or formula; in the first six months, do not give extra water unless your doctor recommends it
Measure the fever with the right method and write it down
Do not give routine medicine in advance to prevent a fever; use it only if your healthcare team specifically recommends it. The medicine and the dose should be set by a doctor based on age/weight
Do not rub the injection site

When Should You See a Doctor?

In a baby younger than three months, a measured fever of 38 °C or higher, even after vaccines, needs medical evaluation without delay.

If a baby aged three to six months has a fever, contact your healthcare team the same day.
If the fever keeps rising, lasts longer than an expected vaccine reaction, or your baby does not seem well, get an evaluation; don't automatically put the symptoms down to the vaccine.
If there is difficulty breathing, swelling of the tongue/throat, turning blue, a seizure or unresponsiveness, call your local emergency number (112 in Türkiye).
If your baby cannot feed, has noticeably little urine or is hard to wake, do not wait.

Summary

A mild fever after vaccines is usually temporary and can be managed with home care. However, your baby's age and any accompanying symptoms should be assessed carefully.

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