Childhood Vaccine Safety
Get science-backed answers to common childhood vaccine myths, including concerns about autism, immunization timing and vaccine ingredients.
Childhood Vaccine Safety
Get science-backed answers to common childhood vaccine myths, including concerns about autism, immunization timing and vaccine ingredients.
Because your child’s health — and your peace of mind — matter
Vaccines are one of the most carefully studied ways to protect your child’s health. They are safe, effective and recommended by pediatricians across the country.
Scientists rigorously test vaccines for many years before approval and continually monitor them for safety and effectiveness.
Your child may have mild side effects, such as a sore arm or a slight fever. But serious side effects are extremely rare.
Getting the disease is almost always more dangerous than getting the vaccine.
Common myths and facts about vaccine safety
We want to help you feel confident making decisions for your family. Let’s walk through some common myths with science-based facts.
Myth: Vaccines cause autism.
Fact: Vaccines don’t cause autism. Decades of research across the world have found no link between vaccines and autism.
Myth: Too many vaccines overwhelm the immune system.
Fact: Your child’s immune system fights thousands of germs every day. The vaccine schedule is carefully timed to ensure safety and effectiveness.
Myth: Spacing out or skipping vaccines is safer.
Fact: Delaying shots leaves children vulnerable longer. The recommended schedule offers the best protection at the best time.
Myth: Vaccines contain dangerous ingredients.
Fact: Scientists test every vaccine ingredient for safety. Vaccines use tiny amounts of vaccine ingredients—far less than what your child naturally encounters.
Myth: The disease is mostly gone. Why vaccinate?
Fact: Diseases such as measles and polio can return if vaccination rates drop. Vaccines help protect your child and your community.
Parent checklist: How to know if vaccine information is trustworthy
Some of what you read or hear may sound convincing, but not everything is backed by science. Before you believe or share something online, ask yourself:
- Who said it? Is this information from a trusted source, such as a doctor or hospital, rather than a social media account?
- Does medical evidence support it? Look for credible sources.
- Does it sound extreme? Watch for red-flag words like “shocking” or “secret.”
- Can I confirm it? Fact-check what you see using trusted websites.
- Is it up to date? Medical guidance changes — always check the date.
- What would my child’s provider say? If something feels confusing, ask your child’s provider.
Still have questions about vaccines? Talk to a provider you trust.
At UW Medicine, we help parents make informed decisions based on scientific evidence. Our providers follow evidence-based guidance from trusted organizations, including:
- King County Public Health
- The Washington State Department of Health
- American Academy of Pediatrics – Fact Checked
- HealthyChildren.org, including Follow Pediatricians for Trustworthy Content on Children’s Health
- Immunize.org
If you have questions about vaccine safety, talk to your child’s primary care provider. They know your child and can help you make the best choices.
Schedule appointment online
Parents with proxy access can use MyChart to schedule a well-child visit. New patients can book a well-child visit online.
Call 206.520.5000
Call 206.520.5000 to schedule a well-child visit or leave a message for your child’s care team.