Is stupidity innate or acquired?

If a person is stupid, it must be born, not acquired. Because a person is stupid, he won't get stupid slowly in the back, he can get smart slowly, and he can't get stupid slowly unless he acts recklessly and deliberately causes such a result.

Stupidity is innate, because we say that people have something called IQ, which is high or low, so people with high IQ are born smart, and people with low IQ are born stupid.

So if you want to know whether it is natural or acquired, you can analyze and think for yourself.