Child Immunization Schedule Notes

Recommendations for Ages 18 Years or Younger, United States, 2024

How to use the schedule

To make vaccination recommendations, healthcare providers should:

  1. Determine recommended vaccine by age (Table 1 - By Age)
  2. Determine recommended interval for catch-up vaccination (Table 2 - Catch-up)
  3. Assess need for additional recommended vaccines by medical condition or other indication (Table 3 - By Medical Indication)
  4. Review vaccine types, frequencies, intervals, and considerations for special situations (Notes)
  5. Review contraindications and precautions for vaccine types (Appendix)
  6. Review new or updated ACIP guidance (Addendum)


For vaccination recommendations for persons ages 19 years or older, see the Recommended Adult Immunization Schedule, 2024.

Additional information

  • For calculating intervals between doses, 4 weeks = 28 days. Intervals of ≥4 months are determined by calendar months.
  • Within a number range (e.g., 12–18), a dash (–) should be read as “through.”
  • Vaccine doses administered ≤4 days before the minimum age or interval are considered valid. Doses of any vaccine administered ≥5 days earlier than the minimum age or minimum interval should not be counted as valid and should be repeated as age appropriate. The repeat dose should be spaced after the invalid dose by the recommended minimum interval. For further details, see Table 3-2, Recommended and minimum ages and intervals between vaccine doses, in General Best Practice Guidelines for Immunization.
  • Information on travel vaccination requirements and recommendations is available at
  • For vaccination of persons with immunodeficiencies, see Table 8-1, Vaccination of persons with primary and secondary immunodeficiencies, in General Best Practice Guidelines for Immunization, Immunization in Special Clinical Circumstances (In: Kimberlin DW, Barnett ED, Lynfield Ruth, Sawyer MH, eds. Red Book: 2021–2024 Report of the Committee on Infectious Diseases. 32nd ed. Itasca, IL: American Academy of Pediatrics; 2021:72–86).
  • For information about vaccination in the setting of a vaccine-preventable disease outbreak, contact your state or local health department.
  • The National Vaccine Injury Compensation Program (VICP) is a no-fault alternative to the traditional legal system for resolving vaccine injury claims. All vaccines included in the child and adolescent vaccine schedule are covered by VICP except for dengue, PPSV23, RSV, Mpox, and COVID-19 vaccines. Mpox and COVID-19 vaccines are covered by the Countermeasures Injury Compensation Program (CICP). For more information, see or

COVID-19 vaccination
(minimum age: 6 months [Moderna and Pfizer-BioNTech COVID-19 vaccines], 12 years [Novavax COVID-19 Vaccine])

Dengue Vaccination
(minimum age: 9 years)

Diphtheria, tetanus, and pertussis (DTaP) vaccination
(minimum age: 6 weeks [4 years for Kinrix® or Quadracel®])

Haemophilus influenzae type b vaccination
(minimum age: 6 weeks)

Hepatitis A vaccination
(minimum age: 12 months for routine vaccination)

Hepatitis B vaccination
(minimum age: birth)

Human papillomavirus vaccination
(minimum age: 9 years)

Influenza vaccination
(minimum age: 6 months [IIV], 2 years [LAIV4], 18 years [recombinant influenza vaccine, RIV4])

Measles, mumps, and rubella vaccination
(minimum age: 12 months for routine vaccination)

Meningococcal serogroup A,C,W,Y vaccination
(minimum age: 2 months [MenACWY-CRM, Menveo], 2 years [MenACWY-TT, MenQuadfi]), 10 years [MenACWY-TT/MenB-FHbp, Penbraya])

Meningococcal serogroup B vaccination
(minimum age: 10 years [MenB-4C, Bexsero®; MenB-FHbp, Trumenba®; MenACWY-TT/MenB-FHbp, Penbraya])

Mpox vaccination
(minimum age: 18 years [Jynneos®])

Pneumococcal vaccination
(minimum age: 6 weeks [PCV15], [PCV 20]; 2 years [PPSV23])

Poliovirus vaccination
(minimum age: 6 weeks)

Respiratory syncytial virus immunization
(minimum age: birth [Nirsevimab, RSV-mAb (Beyfortus™)

Respiratory syncytial virus vaccination
(RSV [Abrysvo™])

Rotavirus vaccination
(minimum age: 6 weeks)

Tetanus, diphtheria, and pertussis (Tdap) vaccination
(minimum age: 11 years for routine vaccination, 7 years for catch-up vaccination)

Varicella vaccination
(minimum age: 12 months)