“…Since this birth cohort began their childbearing, there have been changes in the observed associations between childbearing and its most commonly studied socio-economic determinants (Berrington et al, 2015;Berrington and Pattaro, 2014;Hobcraft, 1996;Kneale and Joshi, 2008;O'Leary et al, 2010;Rendall and Smallwood, 2003;Steele et al, 2005Steele et al, , 2006. The most prominent determinants of UK fertility trends over the last 30 years include an increased participation in higher education among women, an increase in female employment and a reduction in the prevalence of marriage (Aassve et al, 2006;Berrington and Pattaro, 2014;Chamberlain and Gill, 2005;Neels et al, 2017;Ní Bhrolcháin and Beaujouan, 2012;Office for National Statistics, 2016;Sigle-Rushton, 2008;Steele et al, 2005Steele et al, , 2006.…”