> Leveraging a large on-going longitudinal study of child neurodevelopment, we examined general childhood cognitive scores in 2020 and 2021 vs. the preceding decade, 2011-2019. We find that children born during the pandemic have significantly reduced verbal, motor, and overall cognitive performance compared to children born pre-pandemic. Moreover, we find that males and children in lower socioeconomic families have been most affected.

Blatant, blatant, family-level confounding is driving this. Having kids dropped like a stone in covid, because who would be so irresponsible as to have a child during a pandemic? During lockdown? And with global warming the way it is? (The opening of _Idiocracy_ is justly famous.) So, who then is having kids...?

It's like maternal smoking. If you look at kids with mothers who smoke vs the kids with mothers who don't smoke, the latter are healthier and more functional; however, if you look at siblings whose mother smoked during one sibling's pregnancy but not the other's, they are often identical. That's because what you are measuring is the effect of 'having a mother who will smoke', not the effect of 'smoking'.