The childhood vaccine schedule, explained simply

Vaccines are one of the most important — and most studied — things we do in pediatric care. They protect your child from diseases that, within living memory, regularly killed or disabled children. They also protect the babies, grandparents, and immunocompromised neighbors around you.

If the schedule feels overwhelming, you are not alone. Here is the short version, the long version, and the answers to the questions parents ask us most.

The short version, by age

We follow the CDC and American Academy of Pediatrics immunization schedule. Roughly:

• Birth: Hepatitis B (#1)
• 2 months: DTaP, Hib, IPV (polio), PCV, RV, HepB (#2)
• 4 months: DTaP, Hib, IPV, PCV, RV
• 6 months: DTaP, Hib, PCV, RV, HepB (#3), flu (annually starting now)
• 12–15 months: MMR, Varicella (chickenpox), Hib booster, PCV booster, HepA (#1)
• 18 months: DTaP booster, HepA (#2)
• 4–6 years: DTaP, IPV, MMR, Varicella boosters before kindergarten
• 11–12 years: Tdap, HPV (2 doses), Meningococcal (MenACWY) (#1)
• 16 years: MenACWY booster, MenB (shared decision-making)
• Annually, age 6 months+: Flu vaccine; COVID-19 per current recommendations

What each one protects against

Vaccine	Protects against
HepB	Hepatitis B (liver infection, can cause liver cancer)
DTaP / Tdap	Diphtheria, Tetanus, Pertussis (whooping cough)
Hib	Haemophilus influenzae type b (meningitis, epiglottitis)
IPV	Polio
PCV	Pneumococcal disease (pneumonia, meningitis, ear infections)
RV	Rotavirus (severe dehydrating diarrhea)
MMR	Measles, Mumps, Rubella
Varicella	Chickenpox (and prevents shingles later)
HepA	Hepatitis A
HPV	Human papillomavirus — prevents 6 different cancers
MenACWY / MenB	Meningococcal disease (meningitis, sepsis)
Flu	Seasonal influenza
COVID-19	SARS-CoV-2

The questions parents ask us most

Why so many at once? The doses are timed to the windows in which your child’s immune system can build the strongest, longest-lasting protection — and before the ages at which these diseases are most dangerous. Spreading vaccines out delays protection without improving safety.

Are they safe to give together? Yes. Decades of studies show that combination visits are safe and that the immune system handles many antigens at once without difficulty (a single common cold exposes the body to far more antigens than a full vaccine visit).

What about side effects? Most kids have a sore arm or leg, mild fussiness, or a low-grade fever for 24–48 hours. Acetaminophen or ibuprofen (if age-appropriate) helps. Severe reactions are extremely rare; we screen for them at every visit.

My child missed a dose. Do we start over? Almost never. We pick up where you left off and catch up on a safe schedule. Bring whatever records you have, and we’ll build a plan.

HPV at 11–12 feels young. It works best before exposure, and the immune response is strongest at this age (only 2 doses needed instead of 3). It prevents six cancers. We strongly recommend it on schedule.

What to bring

If your child has had any vaccines elsewhere — birth hospital, prior pediatrician, urgent care, school clinic — bring records to your first visit. We’ll log them in your chart so you don’t have to remember.

A note from us

We follow the CDC/AAP schedule because the evidence supporting it is overwhelming, and because we want your child — and every child in our community — to be protected. We’re always happy to answer questions, and we will never make you feel rushed through them.

This article is for general educational purposes and is not a substitute for advice from your child’s pediatrician.