... We estimated that, considering demographic balance and the number of persons acquiring Greek citizenship, more than 100,000 foreigners of the first immigration wave (and their descendants) Cohort and period fertility of the two main groups (VHDc+HDc/MHDc+LHDc) differ. The reproductive behaviour of the first group, as in other countries with a long migratory tradition, (Coleman 1994;Andersson 2004;Milewski 2007;Camarota and Zeigler, 2015;Coleman and Dubuc 2010;Milewski 2010;Gebremariam and Beaujot, 2010;Dubuc 2012;Persson and Hoem, 2014;Adserà and Ferrer, 2015;Kulu et al., 2017;Rojas, Bernardi and Schmid, 2018) tends probably to reach progressively that of the nationals. In contrast, the fertility of recently settled women from MD and LD Asian countries mainly from Syria, Iraq, Afghanistan, Iran, Palestine, Turkey, Pakistan and Bangladesh as well as from African countries., most of whom come from Egypt, Algeria, Morocco, Somalia, Eritrea, Republic of Congo, Congo, Cameroon, Sudan, Yemen and Nigeria (Kotzamanis and Karkanis, 2018;Kotzamanis et al. 2020), is much higher than (UN, 2019 a& b) that of nationals as well as of citizens of HD and VHD countriesbelonging to the first migration wave. ...