The Avon Longitudinal Study of Parents and Children (ALSPAC, or the "Children of the 90s' study") is an ongoing longitudinal study of children born to mothers in the Avon Health Authority area between April 1991 and December 1992. Information on the children's health and physical and social environments were collected regularly through questionnaires completed by the children's mothers, mother's partners, as well as the children themselves. Data was also collected through biological samples and measurements, medical records, and educational records. 

The social science sampler datasets available from the UK Data Service are based on data collected between 1990 and 2003 only, and cover household, neighborhood, socioeconomic and employment information, as well as the children's height. More recent data and additional variables may be available through a request at the ALSPAC website.