Childhood Vaccination Schedule: A Parent's Reference Guide

Why the Vaccination Schedule Is Designed the Way It Is

The childhood immunization schedule recommended by the Advisory Committee on Immunization Practices (ACIP) and endorsed by the American Academy of Pediatrics (AAP) is not arbitrary. Each vaccine is timed to provide protection when children are most vulnerable to specific diseases, and when their immune systems are developmentally ready to respond effectively.

Multiple vaccines given at the same visit are carefully tested for safety in combination. Research consistently shows that receiving several vaccines at once does not overwhelm a healthy infant's immune system. The benefit is real: children gain protection earlier, and families make fewer separate clinic trips.

This article is general health information and education — not medical advice. Always consult your child's pediatrician or healthcare provider for guidance specific to your child's health history and needs.

Age-by-Age Vaccine Reference

The schedule below reflects standard ACIP recommendations. Individual circumstances — including premature birth, certain medical conditions, or missed doses — may require a different approach. Your provider can help you navigate catch-up schedules when needed.

Birth to 15 Months

• Hepatitis B (HepB): First dose at birth; series completed by 6–18 months.
• DTaP (diphtheria, tetanus, pertussis): Doses at 2, 4, and 6 months, with boosters at 15–18 months and 4–6 years.
• Hib (Haemophilus influenzae type b): Given at 2, 4, 6 months, and a final dose at 12–15 months.
• IPV (inactivated poliovirus): Doses at 2, 4, and 6–18 months.
• PCV15 or PCV20 (pneumococcal conjugate): Given at 2, 4, 6, and 12–15 months.
• RV (rotavirus): Oral vaccine given at 2 and 4 months (or 2, 4, and 6 months depending on the formulation).
• MMR (measles, mumps, rubella): First dose at 12–15 months.
• Varicella: First dose at 12–15 months.
• Hepatitis A (HepA): Two-dose series beginning at 12–23 months.

Ages 4–6 Years

• DTaP booster: Fifth dose in the series.
• IPV booster: Fourth dose.
• MMR booster: Second dose.
• Varicella booster: Second dose.
• Influenza: Annual vaccination is recommended for all children 6 months and older. See our evidence review of flu vaccines for families for a deeper look at how protection is measured.

Ages 11–12 Years

• Tdap: Single booster replacing the childhood DTaP formulation.
• HPV (human papillomavirus): Two-dose series ideally started at age 11–12; three doses if started at age 15 or older.
• MenACWY (meningococcal): First dose at 11–12, booster at 16.
• MenB (meningococcal B): Recommended for certain risk groups; shared clinical decision-making applies for healthy teens aged 16–23.

Keeping Records and Staying on Track

Most states maintain immunization information systems (IIS) — electronic registries that track a child's vaccine history. Ask your provider how to access your child's records in your state, and keep a personal copy alongside other medical documents.

Missed doses do not require starting over. A catch-up schedule allows children to complete their series at intervals appropriate to their age. The CDC's catch-up immunization scheduler is a publicly available tool that providers use to plan these timelines.

For families managing multiple children or coordinating care across providers, integrating vaccines into a broader preventive care plan can help ensure nothing is missed. Our guide to building a family preventive care calendar offers a practical framework for doing exactly that.

For a broader look at how vaccines fit into your child's overall health from infancy through adolescence, see preventive care across a lifetime.

This article provides general health education and is not a substitute for personalized medical advice. Consult your child's healthcare provider before making any decisions about vaccination.