Millennium Cohort Study (MCS)

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The Millennium Cohort Study (MCS) is a national longitudinal birth cohort study following the lives of around 19,000 young people born in the United Kingdom in 2000-01. This multidisciplinary survey aims to capture the influence of early family context on child development and outcomes. Children from minority ethnic backgrounds and children in Scotland, Wales & Northern Ireland are oversampled to help capture the diversity of backgrounds into which children are born in the beginning of the 21st century.

Centre for Longitudinal Studies (CLS) - Institute of Education (IoE), UCL

Geographic coverage
United Kingdom (England, Scotland, Wales, Northern Ireland)

Start date


Sample type
Birth cohort

Sample details
Children born between September 2000 and January 2002. The sample was selected from a random sample of electoral wards, disproportionately stratified to ensure adequate representation of all four UK countries, deprived areas and areas with high concentrations of Black and Asian families.
An additional 692 families who were eligible for MCS1 but weren't picked up by the child benefit system were recruited at the age 3 survey.

Sample size at recruitment
18,818 children
18,552 families

Sample size at most recent sweep
11,726 children (MCS6)


Age at recruitment

Cohort year of birth


Data access
UK Data Service

Genetic data collected

Linkage to administrative data

Additional information


Related Themes
Birth and perinatal period, cognitive measures, education, ethnicity and race, genetic data, income and socioeconomic status, personality measures, COVID

Also known as Child of the New Century

Reference paper

Connelly R & Platt, L. (2014) Cohort Profile: UK Millennium Cohort Study (MCS). International Journal of Epidemiology, 43, 1719-1725.

Joshi H & Fitzsimmons E. (2016) The Millennium Cohort Study: the making of a multi-purpose resource for social science and policy. Longitudinal and Life Course Studies, 7, 409-430.

Economic and Social Research Council
Department for Education
Department of Health and Social Care
Department for Work and Pensions
Department for Transport
Home Office
Ministry of Justice
Northern Ireland Executive
Scottish Government
Welsh Assembly Government
Wellcome Trust
US Department of Health and Human Services
National Institutes of Health

Sir Siegmund Warburg Voluntary Settlement
International Centre for Child Studies
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