What does little genius mean?

Answer 1

That would be a genius smaller than a big genius but bigger than a tiny genius.

Answer 2

Could mean a small and/or young person who is very intelligent. It would help if you had included the context in which the phrase was used. Adding an update and relocating your question to a more appropriate subcategory would improve your responses.

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Answer 3

Little genius is someone who has a great/rare,  natural ability or skill in something at a very early age.