Abstract
Researchers from Painel USP de Gêmeos have been investigating the rates of multiple births: (i) in the city of São Paulo, (ii) in Brazil, comparing all five regions (Otta et al., 2016; Otta et al., 2019; Varella et al., 2018) in the years 2003 and 2014 and (iii) in Uruguay (Gomez et al., 2019) between 1999 and 2015. The data was extracted from the Information System on Live Births of São …