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• Most caregivers had positive beliefs about routine immunisation. • Many children aged 2–24 months were not up-to-date with all vaccines for age. • Uptake was associated with education, income and ease of access to immunisation. • Child illness and perceived vaccine unavailability were key reasons for missed/delayed immunisation. • Interventions should focus on strategies that are responsive to the context-specific needs and priorities of districts and communities. The COVID-19 pandemic contributed to significant health services declines in South-East Asia including Indonesia, which experienced a decline in routine immunisation of children. This study investigated the influence of the pandemic on the beliefs and experiences of caregivers of children related to routine immunisation. This study involved a cross-sectional survey among 1399 caregivers of children aged 0–24 months in Central Java and West Nusa Tenggara provinces from March–April 2022. Data on beliefs and experiences of childhood immunizations were captured using core items from the WHO/UNICEF Behavioural and Social Drivers of Immunization (BeSD) survey. Bivariate and multivariate logistic regression analyses identified factors associated with uptake of routine immunisations. While nearly all caregivers (95.7%) reported wanting their child to receive all recommended routine immunisations, only 40.3% of children aged 2–24 months were up-to-date with all vaccines for age. Factors associated with up-to-date included higher parental education (aOR: 1.76, 95% CI 1.02–3.05), higher household income (aOR: 1.54, 95% CI 1.09–2.18), and caregivers who found it moderately or very easy to get immunisations (aOR: 2.26/2.22, 95% CI 1.06–4.83/1.06–4.69). Recovery efforts should prioritise responding to the factors associated with immunisation status (e.g., perceived ease of access) and on families experiencing disadvantage (e.g., caregivers with lower education and household income) to ensure protections against future outbreaks that are responsive to the context-specific needs and priorities of districts and communities. [ABSTRACT FROM AUTHOR]