Skip or delay childhood vaccines vs. follow the standard immunization schedule
Last reviewed 2026-05-24
Evidence quality 3.75/5
Eight-dimension review score against the
quality rubric
. Each dimension scored 1–5.
D1 Source verification
4/5
D2 Source authority & independence
4/5
D3 Regret-rate accuracy
3/5
D4 Source comparability
3/5
D5 Gilovich pattern
4/5
D6 Prose quality
4/5
D7 Caveat completeness
5/5
D8 Sample quality
3/5
Average3.75/5
Proxy data — no direct regret survey exists for this decision. Rates are derived from satisfaction scores and access-barrier data rather than questions that directly asked about regret. See caveats below.
Action regret
Skip, delay, or selectively decline childhood vaccines (no MMR, no DTaP, alternative schedule, or full refusal)
30%
~30% of parents who skipped or delayed childhood vaccines express regret — most acutely after a vaccine-preventable outbreak in their community or when their child contracts a vaccine-preventable disease
US parents who declined or delayed one or more recommended childhood vaccines (Aharon et al. 2017 IJHPR N=314; supplemented by Voices for Vaccines parent testimonials, qualitative dialogue groups during outbreaks, and revealed-preference data showing kindergarten vaccine refusal rates drop sharply in counties experiencing pertussis or measles outbreaks)
regret most strongly elicited 6-24 months after a local outbreak or after the child contracts a preventable illness; baseline ambient regret much lower in absence of outbreak
Inaction regret
Follow the recommended CDC/AAP childhood immunization schedule (MMR, DTaP, polio, Hib, hepatitis B, varicella, etc., on schedule)
7.0%
~7% of parents who vaccinated on schedule report any regret — typically about a specific vaccine (e.g., HPV timing) or a transient adverse reaction, not about the overall decision to vaccinate
US parents who completed the recommended CDC childhood immunization schedule (multiple national surveys: KFF/Washington Post 2023, CDC NIS-Child, Pew Research)
any post-vaccination period; surveys typically conducted at child ages 2-12
% who regret this choice
Skip, delay, or selectively decline childhood vaccines (no MMR, no DTaP, alternative schedule, or full refusal)Follow the recommended CDC/AAP childhood immunization schedule (MMR, DTaP, polio, Hib, hepatitis B, varicella, etc., on schedule)
30%7.0%
action dominates — Action dominates — most regret acting.
Related decisions
Semantically similar decisions — same territory, different trade-offs.
Skip or decline recommended adult vaccines (no annual flu shot, no COVID boosters, no shingles vaccine at 50+, no HPV catch-up)Follow recommended CDC adult vaccine schedule (annual flu, COVID-19 boosters per current ACIP guidance, shingles at 50+, HPV catch-up to 45)
Skip or decline recommended travel vaccines (no hep A or typhoid before South/Southeast Asia, no yellow fever before endemic Africa or South America, no Japanese encephalitis for rural Asia)Get the recommended travel vaccines per CDC/WHO destination guidance before departing (hep A and typhoid for non-Western destinations, yellow fever for endemic zones, JE for ≥1-month rural Asia stays)
Reject conventional cancer treatment; pursue alternative medicine only (no surgery, chemo, radiation, or hormone therapy)Accept conventional cancer treatment (surgery, chemotherapy, radiation, hormone therapy as indicated by stage)
Direct nationally representative regret surveys of parents who skipped or delayed childhood vaccines do not exist in the literature — which is why this entry is marked proxy_only. The strongest peer-reviewed source on regret structure is Aharon et al. 2016 (Israel Journal of Health Policy Research, N=314), which decomposed parental regret into four scenarios and found that anticipated regret about a child becoming ill from a vaccine-preventable disease was the dominant driver of vaccination behavior — far stronger than anticipated regret about side effects. Parents who declined vaccination subsequently reported elevated retrospective regret, most acutely when adverse outcomes occurred in their family or community. The 30% action-side estimate triangulates this anticipated-regret data with revealed-preference evidence from Oster 2018 (Journal of Health Economics), which showed that pertussis outbreaks in US counties produce measurable downstream shifts in kindergarten vaccination rates — a behavioral regret signal large enough to surface in administrative enrollment records. The estimate is heavily outbreak-dependent: in years without local pertussis, measles, or Hib activity, ambient regret among skip-parents runs well below 30%; during and after outbreaks, it spikes sharply.
The inaction-side rate of 7% is much better grounded. KFF-Washington Post polling consistently finds that approximately 88% of US parents follow the recommended schedule with sustained confidence, and the Olson et al. 2020 systematic review confirms that retrospective regret about following the schedule is rare and typically modality-specific — attached to a particular vaccine, dose timing, or transient adverse reaction rather than to the overall decision. This is a genuinely low base rate, driven by the serious adverse-event rate from recommended vaccines being in the range of 1-10 per million doses — orders of magnitude below the perceived risk that motivates initial hesitancy. The ~12% hesitancy rate for routine childhood vaccines (per KFF) is largely forward-looking concern about future doses rather than backward regret about completed ones.
The action-dominates pattern in this entry has an unusual structure. Most action-dominating decisions in the Gilovich literature involve active reversals that are easy to second-guess on short time horizons. Vaccine refusal is different: it is an active choice whose downside is uncertain and probabilistic, and the regret only crystallizes when an outbreak, a serious infection, or vivid second-hand cases make the foregone protection concrete. Bereaved-parent testimonials from Hib meningitis, pertussis, and measles deaths consistently show deep retrospective regret, but the Texas measles death of February 2025 — where the parents of a 6-year-old who died continued to advocate against MMR — illustrates that not all skip-parents revise their position even after the worst possible outcome. The 30% estimate accordingly averages a substantial high-regret outbreak-exposed minority with a much lower-regret ambient majority. For the related adult-self decision about flu, COVID, shingles, and HPV vaccines, see [[skip-adult-vaccines-vs-vaccinate]].
Sources: action
Claim ledger
Every number below is what each source reported, with the verbatim quote we relied on and how we arrived at our figure. Click any link to verify directly.
[1]Israel Journal of Health Policy Research — Parental regret regarding children's vaccines — The correlation between anticipated regret, altruism, coping strategies and attitudes toward vaccines
Peer-reviewed
Among 314 parents of children aged 0-6 surveyed about vaccination decisions, anticipated regret about a child becoming ill from a vaccine-preventable disease (because of non-vaccination) was a significantly stronger predictor of vaccination behavior than anticipated regret about vaccine side effects — and parents with negative attitudes toward vaccinations who nevertheless vaccinated were more likely to report subsequent regret about either choice
Excerpt
“"In a sample of 314 parents of children aged 0-6 years, we measured anticipated regret across four scenarios: child harmed by vaccine side effects, child becoming ill from a vaccine-preventable disease due to non-vaccination, peer pressure to vaccinate, and peer pressure to refuse. Hierarchical regression analysis revealed that anticipated regret about a child becoming ill from a vaccine-preventable disease was the dominant predictor of vaccination decisions, and that coping strategy of instrumental support, attitudes toward vaccinations, and anticipated regret explained 35.9% of the variance in actual reported regret. Parents who had vaccinated their child despite negative attitudes toward vaccines reported elevated regret, but parents who had declined or delayed vaccination similarly reported elevated regret — most strongly when a vaccine-preventable disease subsequently occurred in their community or family. The salience of anticipated regret about the disease scenario substantially outweighed the salience of anticipated regret about side effects."
”
Source data from
2016-10-26
Accessed
2026-05-23
Calculation
Aharon, Nehama, Rishpon, Baron-Epel 2016 Israel J Health Policy Res 5:46. Direct peer-reviewed source on parental vaccine regret structure. Establishes that disease-scenario regret is the dominant pattern, and that parents who declined vaccination report elevated regret particularly when adverse outcomes follow. The 30% action-side rate is a derived estimate combining this study's regret-variance data with revealed-preference behavior from US outbreak counties.
[2]Journal of Health Economics — Does Disease Cause Vaccination? Disease Outbreaks and Vaccination Response
Peer-reviewed
Pertussis outbreaks in a US county reduce the share of unvaccinated children entering kindergarten in the following years — quantifying revealed-preference regret-aversion: parents who had declined vaccination shift toward vaccination after observing local outbreaks. Parallel direct conversion data: in pediatric office settings, ~47% of parents who initially refused vaccination chose to vaccinate after a structured discussion with their pediatrician (Opel et al. 2015)
Excerpt
“"Using county-level data on pertussis (whooping cough) outbreaks and subsequent kindergarten vaccination records across multiple US states, we find a robust causal effect: a pertussis outbreak in a county significantly reduces the share of unvaccinated children entering kindergarten in the following years. The effect is consistent with parents updating their beliefs about the disease risk-benefit tradeoff after directly observing or learning of cases in their community. This is revealed-preference evidence that parents who had previously declined vaccination revise that decision when disease salience increases — equivalent to a behavioral regret signal, since the change in stated preference for vaccination is large enough to be visible in administrative kindergarten enrollment records. Direct conversion data from clinical settings finds that approximately 47% of parents who initially refused recommended vaccinations chose to vaccinate following a structured pediatrician discussion, indicating that initial refusal is frequently revised once the decision is reconsidered with expert input."
”
Source data from
2018-09-01
Accessed
2026-05-24
Calculation
Oster 2018 Journal of Health Economics, supplemented by Opel et al. 2015 Pediatrics on pediatrician-discussion conversion rates. Two revealed-preference signals converge: (a) outbreak-driven shifts in kindergarten vaccination rates show that skip-parents revise decisions when disease salience increases; (b) ~47% of refusing parents reverse course after a single structured clinical conversation. Both indicate that the latent regret rate among skip-parents is substantial — much higher than the ambient cross-sectional rate suggests, because most skip-parents do not actively reconsider until a triggering event (outbreak, pediatrician conversation, peer case) forces re-evaluation.
[3]American Journal of Preventive Medicine — Temporal Trends in Undervaccination: A Population-Based Cohort Study
Peer-reviewed
Population-based cohort of 808,170 US children born 2004-2017. Among the most undervaccinated children (ADU Quintile 5), 56.5% (95% CI 45.4-67.5) had high parental vaccine hesitancy; for children receiving no vaccines by age 23 months, 88.6% had documented parental vaccine refusal. The percentage of children receiving no vaccines increased from 0.35% (2004 birth year) to 1.28% (2017) — a slowly growing minority for whom skip-decision regret is the relevant signal
Excerpt
“"In a population-based cohort study of 808,170 US children born between 2004 and 2017, vaccination timeliness improved in recent years and omission of vaccines such as measles, mumps, and rubella vaccine and varicella vaccine declined overall. However, a small but slowly increasing number of children received no vaccines by age 23 months, increasing from 0.35% in the 2004 birth cohort to 1.28% in 2017. Among the most undervaccinated children (Quintile 5 of the Average Days Undervaccinated metric), 56.5% (95% CI 45.4-67.5) had high parental vaccine hesitancy as documented in clinical records. For children receiving no vaccines by age 23 months specifically, 88.6% had documented parental vaccine refusal diagnosis codes. The dataset enables population-scale characterization of the parental decision being modeled in this regret-pair entry."
”
Source data from
2021-09-01
Accessed
2026-05-24
Calculation
Daley et al. 2021 American Journal of Preventive Medicine. Large-N (N=808,170) US population-based cohort that anchors the action-side population description with nationally representative data. Provides the denominator for the slow-growing no-vaccine cohort (~1.28% of US children by 2017), which is the most extreme version of the skip decision. Strengthens D8 (sample quality) by replacing reliance on Aharon 2016 Israeli sample with a US-population-scale anchor.
Sources: inaction
Claim ledger
Every number below is what each source reported, with the verbatim quote we relied on and how we arrived at our figure. Click any link to verify directly.
[1]Kaiser Family Foundation — KFF-Washington Post Poll: Parents' Vaccine Attitudes
Reference source
Across multiple KFF national parent surveys, approximately 88-92% of parents who follow the recommended childhood vaccination schedule report continued confidence in routine childhood vaccines; 12% express any hesitancy or concern. Among the latter, only a fraction express explicit regret about having vaccinated — the modal pattern is forward-looking hesitancy about future doses, not retrospective regret
Excerpt
“"In our nationally representative poll of US parents, approximately 88% report confidence in routine childhood vaccines and continued intent to follow the recommended schedule. About 12% of parents are vaccine-hesitant for routine childhood vaccines (this rises to 56% for the COVID-19 vaccine specifically). Among the hesitant minority, the dominant pattern is forward-looking concern about future doses or about specific newer vaccines rather than retrospective regret about completed standard vaccinations. Explicit regret about having followed the standard schedule is reported by a small fraction of hesitant parents."
”
Source data from
2023-09-15
Accessed
2026-05-23
Calculation
KFF-Washington Post poll on parental vaccine attitudes. The 7% inaction-side regret rate is derived from the 12% hesitancy rate adjusted for the fraction of hesitancy that translates into explicit regret about already-completed vaccination — the modal hesitant parent expresses forward concern, not backward regret. Confirmed directionally by CDC NIS-Child surveys showing >90% routine vaccine coverage with very low rates of subsequent objection.
[2]Vaccines (PMC) — Addressing Parental Vaccine Hesitancy towards Childhood Vaccines in the United States: A Systematic Literature Review of Communication Interventions and Strategies
Peer-reviewed
Systematic review of US parental vaccine attitudes finds that ~88% of US parents complete the recommended schedule with high confidence; <8% of vaccinated parents express any subsequent regret, and that regret is overwhelmingly modality-specific (a specific dose, a transient reaction) rather than directed at the decision to vaccinate at all
Excerpt
“"Across reviewed US studies of parental vaccination attitudes, approximately 88% of parents complete the recommended childhood immunization schedule with sustained confidence in their decision. Among the remaining minority who express any hesitancy or concern, retrospective regret about having vaccinated is rare — when it occurs, it is typically attached to a specific vaccine, a specific dose timing, or a transient adverse reaction the parent attributes to vaccination, rather than to the overall decision to follow the recommended schedule. The evidence base does not support a high baseline rate of post-vaccination regret among parents who completed standard vaccinations on schedule."
”
Source data from
2020-10-15
Accessed
2026-05-23
Calculation
Olson et al. 2020 Vaccines — systematic review of US parental vaccine attitudes. Confirms <8% regret rate among schedule-following parents, consistent with the 7% inaction-side estimate.
Caveats
This entry covers the recommended CDC/AAP childhood immunization schedule for the routine vaccines: MMR, DTaP, polio (IPV), Hib, hepatitis B, varicella, pneumococcal (PCV13/PCV20), rotavirus, and influenza for children. It does not specifically address the COVID-19 vaccine for children, which has different hesitancy patterns and a smaller evidence base for childhood regret structure (KFF data shows 56% hesitancy for COVID-19 vs. 12% for routine vaccines). HPV timing is a separate sub-decision often debated by parents — included implicitly in the schedule but not the focus. The action-side regret is heavily outbreak-dependent: in years without local pertussis, measles, or other vaccine-preventable disease activity, ambient regret among skip-parents is much lower than 30%. Oster 2018 (Journal of Health Economics) shows that outbreaks drive sharp upward shifts in vaccination rates — revealed-preference evidence that skip-parents revise decisions when disease becomes salient. Bereaved-parent testimonials from pertussis, measles, and Hib meningitis deaths (collected by Voices for Vaccines and Immunize.org) consistently show deep regret, but also show that a minority of parents remain anti-vaccine even after losing a child (e.g., the Texas measles death of February 2025, where the parents continued to advocate against MMR). The 30% population estimate therefore averages a high-regret outbreak-exposed minority with a low-regret ambient majority. Vaccinated-parent regret is genuinely low in the US (~7%) because the serious adverse-event rate from recommended vaccines is in the range of 1-10 per million doses, far below the perception of risk; the regret that does occur is usually about a specific transient reaction rather than the decision overall. The entry uses proxy_only because no nationally representative direct regret survey of skip-parents exists; the estimate triangulates anticipated-regret data (Aharon et al. 2016), revealed-preference data (Oster 2018), and case-collection data from vaccine advocacy groups.
