The first vaccinations are a milestone that many parents approach with a mixture of relief and anxiety. Understanding what vaccines are given, why, and what to expect helps remove some of the uncertainty — and reduces the chance of missing an important appointment.
For a comprehensive overview, see our complete guide to child health.
Before the First Vaccines: Protection at Birth
Newborns are not entirely unprotected. They receive maternal antibodies through the placenta during pregnancy, which provide temporary protection against some diseases. Breast milk, especially colostrum, adds further immune factors. If you were vaccinated against whooping cough (pertussis) during pregnancy — recommended from 16 weeks — your baby receives some protection from your antibodies before their own vaccines begin.
Hepatitis B vaccination is offered at birth to babies born to mothers who are hepatitis B positive, or where there is other significant risk of transmission.
Vitamin K, offered to all newborns, is not a vaccine but an injection that prevents vitamin K deficiency bleeding — a rare but serious condition. It can also be given orally.
The 8-Week Appointments: What's Given
The UK childhood immunisation schedule begins at 8 weeks. The standard 8-week vaccines are:
6-in-1 vaccine (DTaP/IPV/Hib/HepB): A combined vaccine covering 6 diseases:- Diphtheria
- Tetanus
- Pertussis (whooping cough)
- Polio
- Haemophilus influenzae type b (Hib) — a cause of serious meningitis
- Hepatitis B
Pneumococcal (PCV13) vaccine: Protects against 13 types of Streptococcus pneumoniae bacteria, which cause pneumonia, meningitis, and blood infections.
Rotavirus vaccine (oral): Protects against rotavirus — the most common cause of severe gastroenteritis (diarrhoea and vomiting) in babies under 5. This is given as drops into the mouth, not an injection.
MenB vaccine: Protects against meningococcal group B bacteria, a leading cause of bacterial meningitis in the UK.
The 8-week appointment involves 3 injections and one oral vaccine. It's a lot in one visit — and understandably stressful — but the schedule is designed to build protection as early and efficiently as possible.
What to Expect After Vaccinations
Normal reactions are common and reflect the immune system responding:
- Sore, red, or swollen leg at the injection site. This usually settles within 2–3 days.
- Fussiness and crying — often more than usual for the rest of the day.
- Mild fever — temperature of 38–38.5°C is common, especially after MenB.
- Unsettled sleep.
For the MenB vaccine specifically, the NHS recommends giving infant paracetamol (at the appropriate dose for weight) at the time of vaccination, and again at 4–6 hours and 8–12 hours after, to reduce fever. This is because MenB is more likely to cause fever than the other vaccines.
When to Seek Medical Advice
Seek medical help if:
- Temperature rises above 39°C or the baby appears unwell beyond expected fussiness
- Swelling or redness at the injection site is spreading significantly
- Baby is difficult to rouse or unusually limp
- Crying is high-pitched, continuous, and lasts more than 3 hours
- Baby has a fit (seizure) — though rare, this can happen with fever and should be assessed
Serious allergic reactions (anaphylaxis) to vaccines are extremely rare — affecting approximately 1–2 per million doses. Clinics are equipped to manage this immediately, which is why you stay for 15 minutes after the vaccine.
Vaccine Safety: What the Evidence Shows
Vaccines are among the most carefully studied medical interventions in existence. Before licensing, vaccines go through years of clinical trials. After licensing, their safety continues to be monitored by multiple national and international surveillance systems.
The claim that the MMR vaccine causes autism was based on a fraudulent 1998 paper since retracted; the researcher's medical licence was removed. Dozens of large, independent studies involving millions of children have found no link between any vaccine and autism.
The risks from vaccine-preventable diseases are real. Pertussis (whooping cough) can be life-threatening in babies under 3 months. Meningitis caused by Hib or meningococcal bacteria can kill within hours. The vaccines protect against these.
Keeping Track
Your baby's vaccination record is kept in their Personal Child Health Record (the red book). Keep it safe — you'll need it when starting nursery and school. If you ever miss an appointment, contact your GP to catch up. Vaccines can be given slightly later than scheduled without loss of effectiveness.
Key Takeaways
UK babies receive their first vaccines at 8 weeks: 6-in-1 (diphtheria, tetanus, pertussis, polio, Hib, hepatitis B), pneumococcal, rotavirus (oral), and meningococcal B vaccines. Normal reactions include mild fever, fussiness, and local swelling lasting 2-3 days; MenB requires prophylactic paracetamol to prevent fever. Serious allergic reactions are extremely rare (1-2 per million doses). Vaccines undergo rigorous pre- and post-licensing safety monitoring; the MMR-autism claim has been thoroughly debunked by multiple independent studies.
