Why do babies sleep after vaccines?

Related questions

1. Is the MMR vaccine live?
2. What shots do they give newborns?
3. Is Hep B vaccine necessary for newborns?
4. When can I take my newborn out?
5. When can I take a newborn out in public?
6. What is the risk of not vaccinating your child?
7. How long does the flu last in babies?
8. How long does a fever last after immunizations?
9. How many people have died from polio?
10. Can tetanus be treated after symptoms appear?

Tags

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18. #sleep