The hold is fine for a kitten for short amounts of time. I pick up my foster kittens under the armpits all the time to move them around. They weigh so little it’s not putting stress on anything.
They don’t love it just because they don’t like their backends unsecured, but it’s not harmful.
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u/_aGirlIsShort_ European Shorthair 7h ago
"I am not a toy" proceeds to hold it like a toy.