Delay guide · HepA
Delaying the Hepatitis A vaccine
HepA: 2 doses; first dose from 12 months; second dose at least 6 months after the first (CDC). Delaying lengthens the time your child is unprotected against hepatitis A. Young children are more likely than adults to have hepatitis A without symptoms.
Key takeaways
- Can it be delayed? Yes. It can be spaced out, but the number of doses stays the same.
- Hepatitis A needs 2 doses however late it starts. A later start moves every dose later; it does not remove any.
- Young children are more likely than adults to have hepatitis A without symptoms.
- 20 of 51 jurisdictions (50 states and DC) list Hepatitis A as a kindergarten requirement in our data. Dose counts and grade ranges vary; check your state page.
Can the Hepatitis A vaccine be delayed?
Yes. It can be spaced out, but the number of doses stays the same.
Delaying means a longer stretch during which your child has less protection than the CDC's on-time schedule would give, and sometimes more visits overall. It does not make the vaccine less effective once the series is complete. Whether that trade-off suits your child is a decision for you and your child's healthcare practitioner.
What changes if you start later?
Hepatitis A needs 2 doses however late it starts. A later start moves every dose later; it does not remove any.
- 2 doses, ≥6 months apart; first dose at/after 12 months.
- Required for school entry in some states only.
- Recommendation status has been in regulatory flux since 2025 (court stay under appeal as of Oct 2026) — confirm current guidance.
Compare all vaccines or read how delayed schedules work.
What are the risks of waiting?
Young children are more likely than adults to have hepatitis A without symptoms.
- The CDC says anyone who has not been vaccinated or previously infected can get hepatitis A, and that young children are more likely than adults to have it without symptoms.
- The CDC and AAP differ on this vaccine: the AAP recommends it routinely, while the CDC's January 2026 schedule (currently stayed by a court) treats it as high-risk plus shared decision-making.
Sources: About hepatitis A .
What are the minimum ages and intervals for Hepatitis A?
A minimum age and a minimum interval are the earliest a dose counts. The CDC allows a 4-day grace period. Waiting longer than the minimum is always allowed.
| First dose at | Total doses | Minimum age and gap, by dose |
|---|---|---|
| 12 months or older | 2 |
|
How do you catch up on Hepatitis A?
The CDC says a vaccine series does not need to be restarted, however much time has passed between doses; doses already given still count. See the catch-up schedule guide.
- Two doses are given at least 6 months apart, the first at 12 months or later.
Is the Hepatitis A vaccine required for school?
20 of 51 jurisdictions (50 states and DC) list Hepatitis A as a kindergarten requirement in our data. Dose counts and grade ranges vary; check your state page.
States that require it: Alaska , Arkansas , Connecticut , District of Columbia , Georgia , Hawaii , Idaho , Indiana , Kansas , Kentucky , Louisiana , Nevada , New Mexico , Oklahoma , Oregon , South Carolina , Tennessee , Texas , Utah , Virginia
Look up your state. Many states also allow provisional enrollment while a series is in progress.
Frequently asked questions
Can the Hepatitis A vaccine be delayed?
Yes. It can be spaced out, but the number of doses stays the same. Hepatitis A needs 2 doses however late it starts. A later start moves every dose later; it does not remove any.
What are the risks of delaying the Hepatitis A vaccine?
The CDC says anyone who has not been vaccinated or previously infected can get hepatitis A, and that young children are more likely than adults to have it without symptoms. The CDC and AAP differ on this vaccine: the AAP recommends it routinely, while the CDC's January 2026 schedule (currently stayed by a court) treats it as high-risk plus shared decision-making.
What is the minimum age for the Hepatitis A vaccine?
The first dose of Hepatitis A can be given from 12 months. Later doses have their own minimum ages and minimum intervals after the previous dose, shown in the table on this page. The CDC counts a dose given up to 4 days before a minimum age or interval.
Is the Hepatitis A vaccine required for school?
20 of 51 jurisdictions (50 states and DC) list Hepatitis A as a kindergarten requirement in our data. Dose counts and grade ranges vary; check your state page.
See how Hepatitis A fits into a full plan
The free planner applies these rules for you and shows what fits before a school deadline. Review the result with your child's healthcare practitioner.
Build my plan →Sources
Primary sources only. Links open the publisher's own page.