Abstract

Birth rates in Canada and the USA declined sharply in March 2020 and deviated from historical trends. This decline was absent in similarly developed European countries. We argue that the selective decline was driven by incoming individuals, who would have travelled from abroad and given birth in Canada and the USA, had there been no travel restrictions during the COVID-19 pandemic. Furthermore, by leveraging data from periods before and during the COVID-19 travel restrictions, we quantified the extent of births by incoming individuals. In an interrupted time series analysis, the expected number of such births in Canada was 970 per month (95% CI: 710-1,200), which is 3.2% of all births in the country. The corresponding estimate for the USA was 6,700 per month (95% CI: 3,400-10,000), which is 2.2% of all births. A secondary difference-in-differences analysis gave similar estimates at 2.8% and 3.4% for Canada and the USA, respectively. Our study reveals the extent of births by recent international arrivals, which hitherto has been unknown and infeasible to study.

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