How to Say "wonder kid" in Spanish
The Spanish word for “wonder kid” is “prodigio” — B1 level. This is a very common word in everyday Spanish.

Examples
Wolfgang Amadeus Mozart fue un niño prodigio.
Wolfgang Amadeus Mozart was a child prodigy.
Ella es un prodigio del piano y toca en teatros desde los cinco años.
She is a piano prodigy and has been playing in theaters since she was five.
Incluso entre expertos, él destaca como un auténtico prodigio de las matemáticas.
Even among experts, he stands out as a true math prodigy.
The Gender of 'Prodigio'
Even when you are talking about a girl or a woman, the word 'prodigio' is always masculine (un prodigio). You don't change it to 'prodigia'.
Combining Two Nouns
When you see 'niño prodigio,' the second word describes the first one directly. You don't need 'de' (of) in between.
Avoid 'La Prodigia'
Mistake: “Ella es una prodigia de la música.”
Correction: Ella es un prodigio de la música. The word 'prodigio' is a fixed masculine noun in Spanish.
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