The short version: Vaccination schedules are timed to match when a child's immune system is ready and when protection is most needed. Missing doses delays protection — it does not cancel it. Keep a digital copy of every vaccine record.
Why the timing of vaccines is not arbitrary
Parents sometimes wonder why a vaccine is given at two months and not at birth, or why boosters are spaced the way they are. The schedule is the result of decades of clinical research into when the immune system is developmentally ready to respond effectively to each vaccine and when the disease risk is highest.
Newborns receive some protection from maternal antibodies, but this fades. The window between that natural protection fading and the child building their own through vaccination is when infants are most vulnerable. The schedule is designed to close that window as tightly as possible.
Delaying vaccines does not make them safer. It prolongs the period of vulnerability without any clinical benefit.
A plain-language overview of the schedule
Birth: In many countries, the Hepatitis B vaccine is given at birth, before the baby leaves hospital. This protects against a virus that can be transmitted during delivery.
6-8 weeks: The first round of combination vaccines begins, typically covering diphtheria, tetanus, whooping cough (pertussis), polio, Hib, and hepatitis B in a single injection. The rotavirus vaccine is given orally at the same visit.
3-4 months: Second doses of the same combination vaccines. A second dose of rotavirus. The MenB (meningococcal B) vaccine is introduced.
6 months: Third doses of combination vaccines. Third dose of hepatitis B in some schedules.
12-15 months: MMR vaccine (measles, mumps, rubella), chickenpox vaccine (in some countries), and boosters for Hib and MenC or MenACWY depending on the national schedule.
4-6 years: Pre-school boosters for DTaP and polio. Second MMR dose.
11-12 years: HPV vaccine (human papillomavirus), meningococcal boosters, Tdap booster. Annual influenza vaccine is recommended year-round from six months of age.
What to do if your child misses a vaccine
Missing a scheduled vaccine is not the end of the world. Most vaccines can be given late — the series simply picks up where it left off, sometimes with a modified schedule. Contact your GP or paediatrician and they will advise on a catch-up schedule appropriate for your child's age.
The one thing not to do is assume that because a vaccine was missed, it is no longer relevant. Many childhood diseases are still present in communities and can cause serious complications in unvaccinated children of any age.
Important: Always consult your GP or paediatrician for personalised vaccination advice. National schedules vary by country, and individual circumstances (premature birth, certain medical conditions) can affect timing.
Keeping vaccination records that are actually useful
The paper vaccination card issued at birth is the official record — but paper is fragile. Cards get wet, torn, lost in house moves, or simply buried in a drawer. By the time your child starts school or needs to travel, finding that card can be genuinely stressful.
The solution is to photograph or scan every vaccine record immediately after each visit and store it digitally in an encrypted health app. Include the vaccine name, the brand, the date, and the batch number (this is important in the rare event of a recall). A good digital record also lets you see at a glance what is upcoming, so appointments do not fall through the cracks.
Keep records for every child in your household in one place. When your child transitions from paediatric to adult care — typically in their teens — a complete vaccination history becomes their own medical baseline for the rest of their life.
Answers to common parent questions
Can my child have multiple vaccines in one visit? Yes. Combination vaccines are designed specifically to reduce the number of injections. Giving several vaccines in one visit does not overwhelm the immune system — newborns encounter hundreds of antigens from their environment every day.
What if my child has a fever after a vaccine? A mild fever and irritability for 24-48 hours after vaccination is normal and indicates the immune system is responding. Use age-appropriate paracetamol if needed. Contact your GP if the fever is very high or lasts more than 48 hours.
Do I need to keep booster records as an adult? Yes. Some childhood vaccines require adult boosters (tetanus every 10 years is the most common). Keeping a lifelong vaccination record means you always know what you have had and what you might need before travel or at certain life stages.