Details of the recommendations can be found here: Changes to the routine childhood vaccination schedule

Please download the calculator to your computer and use it to calculate when a baby or child is due which vaccines. Enter their date of birth in the calculator worksheet. and it will show what they require. In line with the date for the first 18 month appointments for the hexavalent vaccine, children who turn 18 months on or after 01 January 2026 will receive MMR at their 18 month appointment. Bringing MMR dose 2 forward is expected to improve coverage and reduce the likelihood of measles outbreaks. It also ensures a further opportunity at 3 years and 4 months to offer MMR if not received at 18 months.

NB: This calculator assumes vaccinations are administered in line with the routine UK childhood immunisation schedule. It is intended to support clinicians but does not replace clinical judgement or clinical decision making. If any vaccinations are missed, delayed or incomplete, do not use this calculator and instead refer to the UKHSA algorithm document

With thanks to Mark Frost, Immunisation Manager, SW Immunisation and Screening team for support in the development of this tool.