In former communist countries in Eastern Europe, maternity leave up to 3 years is not uncommon now, and was much less uncommon before the fall of the respective regime. Of course kids would be taken out and play with others at playgrounds even if there's no kindergarten and the mother takes care of the kid for 3 years, so it's not total isolation. But the pandemic hasn't resulted in total isolation either, there were schools/kindergartens that opened at least for some periods of time, playgrounds too (past the initial lockdowns which were pretty much full panic mode). Those kids didn't spend 2 years locked at home.
So what's the difference? The masks? Did kids under 3 even wear masks?