Why Do We Need Vaccines If We're Not Sick? for Kids

Dad, How Does It Work? Science Podcast for Kids · Apr 3, 2026 · 5m

Ages 5–10 | Why do we need vaccines if we're not sick? You're feeling totally fine, and then it's time for a vaccine.

Wait, why now? Nothing is even wrong.

So why would your body need a vaccine before you're sick?

What is a vaccine actually doing inside you?

And why do you sometimes feel a little different afterwards?

It turns out your body is getting ready ahead of time. But ready for what, exactly?

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