What is vaccination?

Written by Yuppo Lab Experts.

Updated 27 October 2026

Vaccination is giving vaccines to protect against serious infectious diseases, such as measles, whooping cough and meningitis. Babies are vaccinated according to a schedule set by each country's health authority, timed to protect them when they are most vulnerable.

Key takeaways

  • Vaccines are given by actual age, including for babies born early.
  • Mild fever, fussiness or a sore leg are common for a day or two.
  • If a dose is missed, the schedule can usually be caught up.

What you can do

  • Keep your baby's vaccination record up to date.
  • Ask your doctor about any missed doses.
  • Feed or cuddle your baby during and after the injections.

When to talk to your doctor

Call your local emergency number if your baby has difficulty breathing, swelling of the face or a seizure after a vaccine. See your doctor if a high fever lasts more than 48 hours.

Frequently asked questions

A mild illness is usually not a reason to delay; your doctor will advise if your baby has a high fever.

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