Delaying the COVID-19 vaccine

Can the COVID-19 vaccine be delayed?

Yes, but it is seasonal, so a delay means missing that season.

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?

COVID-19 is not a fixed series. Timing follows the season and product, so a later start does not change a dose count the way it does for the infant series.

• From age 6 months. The AAP recommends it for all children 6–23 months; the CDC recommends it through shared clinical decision-making between parents and clinicians (and for children with moderate to severe immunocompromise).
• CDC routine guidance (Moderna/Spikevax): unvaccinated children 6–23 months get 2 doses, dose 2 at least 4 weeks (4–8 weeks) after dose 1; unvaccinated children 2–4 years get 1 dose. Pfizer-BioNTech is no longer authorized for ages 6 months–4 years. Children with prior COVID-19 vaccine doses follow different rules (e.g., 1 dose at least 8 weeks after the last dose) that this tool does not model.
• 2026–27 FDA labels (Spikevax 6 mo+, Comirnaty 5 y+) cover healthy children under 65 only with a high-risk condition; products and doses change each season.
• Treat as fully optional and confirm current guidance with your child's healthcare practitioner.

Compare all vaccines or read how delayed schedules work.

What are the risks of waiting?

The CDC ties higher risk of severe illness to underlying medical conditions.

• The CDC says people of all ages, including children and teens, can get very sick from COVID-19, especially those with underlying medical conditions.
• For 2026-27 the CDC recommends the vaccine for children 6 months to 17 years with moderate to severe immunocompromise, and through shared clinical decision-making for other children. The AAP recommends it for all children 6 to 23 months.

Sources: COVID-19 risk factors ; COVID-19 vaccine considerations .

What are the minimum ages and intervals for COVID-19?

COVID-19 is not planned as a fixed series. Products, ages and dose counts change each season. Ask your practitioner what applies to your child now.

How do you catch up on COVID-19?

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.

• Products, ages and dose counts change each season. Ask your practitioner what applies to your child now.

Is the COVID-19 vaccine required for school?

In our state data, none of the 51 jurisdictions (50 states and DC) lists COVID-19 as a kindergarten requirement. Some may require it for childcare, and rules change, so check your state page.

Look up your state. Many states also allow provisional enrollment while a series is in progress.

Frequently asked questions

Can the COVID-19 vaccine be delayed?

Yes, but it is seasonal, so a delay means missing that season. COVID-19 is not a fixed series. Timing follows the season and product, so a later start does not change a dose count the way it does for the infant series.

What are the risks of delaying the COVID-19 vaccine?

The CDC says people of all ages, including children and teens, can get very sick from COVID-19, especially those with underlying medical conditions. For 2026-27 the CDC recommends the vaccine for children 6 months to 17 years with moderate to severe immunocompromise, and through shared clinical decision-making for other children. The AAP recommends it for all children 6 to 23 months.

What is the minimum age for the COVID-19 vaccine?

COVID-19 is given from 6 months of age. Products, ages and dose counts change each season. Ask your practitioner what applies to your child now.

Is the COVID-19 vaccine required for school?

In our state data, none of the 51 jurisdictions (50 states and DC) lists COVID-19 as a kindergarten requirement. Some may require it for childcare, and rules change, so check your state page.