A short-term vaccine reaction
Some children develop a low fever, fussiness, tiredness, or reduced appetite after shots. Occasional vomiting may happen, especially if a baby is upset, crying hard, or feeding differently than usual.
Vomiting With Fever After Vaccines in Babies and Young Children
If your baby is vomiting with fever after vaccines, it can be hard to tell what is expected and what needs prompt attention. Get clear, parent-friendly guidance based on when symptoms started, your child’s age, and how they’re acting now.
About 3–5 minutesPrivate assessmentNo long answers
About this assessment
Answer a few questions about the vomiting, fever, and timing after the shots
We’ll use your answers to provide personalized guidance for situations like baby vomiting with fever after vaccines, infant vomiting and fever after shots, or fever and vomiting after baby vaccines.
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Why parents search for vomiting and fever after vaccines
Mild fever can happen after routine immunizations, and some babies may also spit up or vomit around the same time. But when a child is vomiting with fever after vaccines, parents often want help sorting out whether this could be a common short-term reaction, a separate illness that started around vaccination day, or a sign to seek medical care sooner. This page is designed for that exact concern and focuses on practical next steps.
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What can cause vomiting with fever after immunization?
A stomach bug or other illness at the same time
Babies and children can catch viral illnesses that cause fever and vomiting right around the time of vaccines. Timing alone does not always mean the vaccines caused both symptoms.
A reason for medical evaluation
Repeated vomiting, poor drinking, fewer wet diapers, unusual sleepiness, trouble breathing, a very high fever, or a child who seems much sicker than expected should be assessed promptly.
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When vomiting after vaccination with fever may need faster attention
Vomiting keeps happening
If your baby threw up after vaccines and has fever, and the vomiting is frequent or prevents fluids from staying down, dehydration can become a concern.
Your child seems hard to wake, weak, or not acting like themselves
A child who is unusually limp, difficult to arouse, inconsolable, or much less responsive than normal should be evaluated urgently.
There are other concerning symptoms
Seek urgent care for breathing problems, signs of severe dehydration, seizure, a spreading rash, or if your instincts tell you something is not right.
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Why timing matters after 2 month vaccines and other routine shots
The timing of symptoms can help narrow what may be going on. Vomiting and fever within a few hours of vaccines may fit differently than symptoms that begin the next day or 2 or more days later. For example, vomiting and fever after 2 month vaccines may be handled differently depending on whether your baby is feeding normally, how high the fever is, and whether symptoms are improving or getting worse. That’s why the assessment starts by asking when the vomiting and fever began after the vaccines.
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What personalized guidance can help you decide
Whether home monitoring may be reasonable
For some children with mild fever, one-time vomiting, and otherwise normal behavior, supportive care and close observation may be enough.
When to call your pediatrician
If symptoms are persistent, confusing, or your child is very young, a same-day call to your pediatrician may be the best next step.
When urgent care is more appropriate
The assessment helps flag patterns that may need prompt in-person evaluation rather than watchful waiting.
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Frequently asked questions
Is vomiting normal after vaccines with fever?
Mild fever is a common reaction after some vaccines. Vomiting can happen too, but repeated vomiting or vomiting with a child who seems unwell deserves closer attention. The full picture matters, including age, timing, hydration, and behavior.
My baby has fever and vomiting after immunization. Should I worry?
Not every case is an emergency, but it should be taken seriously if your baby cannot keep fluids down, has fewer wet diapers, seems unusually sleepy, has trouble breathing, or the fever is high or persistent. If your baby is very young, contact a clinician sooner rather than later.
Can infant vomiting and fever after shots start the next day?
Yes, some post-vaccine symptoms can begin later the same day or the next day. But symptoms starting 2 or more days later may be less likely to be from the vaccines alone and could point to a separate illness. Timing is one reason the assessment begins with when symptoms started.
What if my child is vomiting with fever after vaccines but also has diarrhea?
Vomiting with fever and diarrhea may suggest a stomach virus or another illness happening around the same time as vaccination. Because dehydration risk can rise quickly in babies and young children, it is important to watch fluid intake, wet diapers, and energy level closely.
Personalized assessment
Get guidance for vomiting and fever after your child’s vaccines
Answer a few questions to receive a personalized assessment based on symptom timing, severity, and your child’s age. It’s a simple way to understand whether home care, a pediatrician call, or faster medical attention may make sense.