How well do they walk, do they talk, do they stack cups, how do they react to various stimulus, etc.
The oldest child born during the pandemic would be about 17 months old. Many are less than one year. Too young to do more than babble. I would not be surprised to find that these kids are behind the curve. It just seems a bit premature to draw hard conclusions and the term “IQ” seems a bit much to describe what you’ve mentioned.
...do they stack cups,
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Excellent way to test for future animal preference.
Future dog person stacks cups.
Future cat person thinks “No! Stack ‘em yourself if you want ‘em stacked!”